单选题During the transition of the Earth’s magnetic field _____.A the compass will become uselessB man and animals will be confused as to directionsC the magnetic strength of the Earth will disappearD the magnetic strength of the Earth will be stronger

题目
单选题
During the transition of the Earth’s magnetic field _____.
A

the compass will become useless

B

man and animals will be confused as to directions

C

the magnetic strength of the Earth will disappear

D

the magnetic strength of the Earth will be stronger

相似考题

1.Permanent magnetism is caused by ______.A.operation of electrical equipment and generators on board shipB.the earth's magnetic field affecting the ship's hard iron during constructionC.the horizontal component of the earth's magnetic field acting on the horizontal soft ironD.the vertical component of the earth's magnetic field acting on the vertical soft iron

2.Deviation in a compass is caused by the ______.A.vessel’s geographic positionB.vessel’s headingC.earth’s magnetic fieldD.influence of the magnetic materials of the vessel

3.If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.A.Compass error and variation are equalB.Compass north will be true northC.Variation will equal deviationD.There will be no compass error

4.The direction of prevailing winds in the Northern hemisphere is caused by the ______．A.Magnetic field at the North PoleB.Gulf StreamC.Earth's rotationD.Arctic cold fronts

更多“During the transition of the Earth’s magnetic field _____.”相关问题

  • 第1题：

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    Some scientists are worrying about the possible disappearance of the Earth's protective magnetic field in the future.
    A: Right
    B: Wrong
    C: Not mentioned

    答案：C
    解析：
    题干意为“太阳的引力太弱，等离子体逃离太阳，流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索，在第一段中找到相关句： The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind．定位线索词集中出现在第一段中，因此重点关注第一段。第一段意为“太阳是多风暴的，有它自己独特的气候。太阳非常热，而且活动又极为剧烈，以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳，流向地球，时速高达100万英里。这些粒子叫等离子体，来自太阳的等离子流叫太阳风。太阳活动越剧烈，太阳风越强烈”。依据第一段的内容来看，等离子体逃离太阳的原因不是因为太阳的引力太弱，而是因为太阳非常热，活动又极为剧烈，由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全，因为有磁场在高空包围着地球，将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索，在第二段中找到相关句：The solar wind constantly streams toward the Earth，but don't worry because a protective magnetic field surrounds our planet（指地 球）.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet．定位线索词集中出现在第二段第一句中，因此重点关注该句。该句提到“太阳风不断地流向地球，但是不必担心，因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索，结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到，some scientists在短文中也没有出现，由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中，并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索，在第三段中找到相关句：The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights．定位线索词集中出现在第三段中，因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子，该原子粒子会被截留在磁场中，并最终落入地球两极的大气层中。等离子流的电子进入地球，与大气层的气体分子发生碰撞，在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光，氧和氮发红绿光，氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层，并与大气层的气体分子发生碰撞时，就会产出极光。题干句表达的意思与短文介绍的极光成因相符，所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大，否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索，在第四段中找 到相关句：Watching auroras (Northern Lights的近义词）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico！定位线索词集中在第四段中，因此重点关注这个段落，尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋，但是通常你只有在极北的地方，例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来，该段最后一句还提到“在太阳风暴达到最高峰的期间，明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”，由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索，结果发现短文中根本没有提到关于游客的信息，因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面，又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索，在短文中寻找相关句，同时因为题千中出现了修饰词 long , thick，也关注这两个修饰词在短文中的出现情况，这样在第五段中找到相关句：Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第2题：

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    You cannot see the Northern Lights unless you are in Alaska or Canada.
    A: Right
    B: Wrong
    C: Not mentioned

    答案：B
    解析：
    题干意为“太阳的引力太弱，等离子体逃离太阳，流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索，在第一段中找到相关句： The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind．定位线索词集中出现在第一段中，因此重点关注第一段。第一段意为“太阳是多风暴的，有它自己独特的气候。太阳非常热，而且活动又极为剧烈，以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳，流向地球，时速高达100万英里。这些粒子叫等离子体，来自太阳的等离子流叫太阳风。太阳活动越剧烈，太阳风越强烈”。依据第一段的内容来看，等离子体逃离太阳的原因不是因为太阳的引力太弱，而是因为太阳非常热，活动又极为剧烈，由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全，因为有磁场在高空包围着地球，将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索，在第二段中找到相关句：The solar wind constantly streams toward the Earth，but don't worry because a protective magnetic field surrounds our planet（指地 球）.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet．定位线索词集中出现在第二段第一句中，因此重点关注该句。该句提到“太阳风不断地流向地球，但是不必担心，因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索，结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到，some scientists在短文中也没有出现，由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中，并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索，在第三段中找到相关句：The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights．定位线索词集中出现在第三段中，因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子，该原子粒子会被截留在磁场中，并最终落入地球两极的大气层中。等离子流的电子进入地球，与大气层的气体分子发生碰撞，在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光，氧和氮发红绿光，氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层，并与大气层的气体分子发生碰撞时，就会产出极光。题干句表达的意思与短文介绍的极光成因相符，所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大，否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索，在第四段中找 到相关句：Watching auroras (Northern Lights的近义词）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico！定位线索词集中在第四段中，因此重点关注这个段落，尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋，但是通常你只有在极北的地方，例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来，该段最后一句还提到“在太阳风暴达到最高峰的期间，明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”，由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索，结果发现短文中根本没有提到关于游客的信息，因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面，又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索，在短文中寻找相关句，同时因为题千中出现了修饰词 long , thick，也关注这两个修饰词在短文中的出现情况，这样在第五段中找到相关句：Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第3题：

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    Tens of thousands of tourists take special trips to Norway and Sweden every year to watch the Northern Lights.
    A: Right
    B: Wrong
    C: Not mentioned

    答案：C
    解析：
    题干意为“太阳的引力太弱，等离子体逃离太阳，流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索，在第一段中找到相关句： The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind．定位线索词集中出现在第一段中，因此重点关注第一段。第一段意为“太阳是多风暴的，有它自己独特的气候。太阳非常热，而且活动又极为剧烈，以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳，流向地球，时速高达100万英里。这些粒子叫等离子体，来自太阳的等离子流叫太阳风。太阳活动越剧烈，太阳风越强烈”。依据第一段的内容来看，等离子体逃离太阳的原因不是因为太阳的引力太弱，而是因为太阳非常热，活动又极为剧烈，由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全，因为有磁场在高空包围着地球，将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索，在第二段中找到相关句：The solar wind constantly streams toward the Earth，but don't worry because a protective magnetic field surrounds our planet（指地 球）.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet．定位线索词集中出现在第二段第一句中，因此重点关注该句。该句提到“太阳风不断地流向地球，但是不必担心，因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索，结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到，some scientists在短文中也没有出现，由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中，并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索，在第三段中找到相关句：The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights．定位线索词集中出现在第三段中，因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子，该原子粒子会被截留在磁场中，并最终落入地球两极的大气层中。等离子流的电子进入地球，与大气层的气体分子发生碰撞，在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光，氧和氮发红绿光，氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层，并与大气层的气体分子发生碰撞时，就会产出极光。题干句表达的意思与短文介绍的极光成因相符，所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大，否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索，在第四段中找 到相关句：Watching auroras (Northern Lights的近义词）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico！定位线索词集中在第四段中，因此重点关注这个段落，尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋，但是通常你只有在极北的地方，例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来，该段最后一句还提到“在太阳风暴达到最高峰的期间，明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”，由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索，结果发现短文中根本没有提到关于游客的信息，因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面，又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索，在短文中寻找相关句，同时因为题千中出现了修饰词 long , thick，也关注这两个修饰词在短文中的出现情况，这样在第五段中找到相关句：Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第4题：

    共用题干
    第一篇
    The Northern Lights
    The sun is stormy and has its own kind of weather.It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour.These particles are called plasma （等离子体）,and the stream of plasma coming from the Sun is called the solar wind.The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth.When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into tile Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky.
    Each atmospheric gas glows a different color.Oxygen and nitrogen glows red and green arid nitrogen glows violet purple.As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras（北极光）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate（跳动）,flicker（闪烁）,or even move like waves.During solar maximum,5 auroras are seen as far south as Florida,even Mexico!Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly.A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime.We know you will never forget it!

    What happens when solar wind comes to the Earth?
    A:It is trapped in magnetic belts around the Earth.
    B:A protective magnetic field is formed at the same time.
    C:It destroys the protective magnetic field surrounding the Earth.
    D:It breaks magnetic field lines and does severe damage to the Earth.

    答案：A
    解析：
    本篇文章主要介绍了北极光的形成、运动以及色彩。
    根据第一段第三、四句可知，热量在时速约100万英里的带电粒子流中由太阳向地球流动，这些粒子被称为等离子体，源于太阳的等离子体流又被称为太阳风。由此不难推测出，太阳风是能量从太阳向地球高速流动造成的，所以选择C项。
    根据第二段第三句可知，带电粒子被困在环绕地球的磁场中，并且根据第一段第三、四句以及第二段第一句可知，这些带电粒子即为太阳风。由此可知，太阳风吹向地球时，会被地球外围的磁场束缚住，所以选择A项。
    根据第二段最后一句可知，电子落向地球时与大气中的气体分子碰撞而产生了光芒；根据第三段第一句和第三句可知，碰撞后每种大气分子发出的光芒不同；不同的光芒在天空中闪现，造成了北极光和南极光；根据第二段第五句可知，原子粒子被称为电子。由此推出，北极光是由电子，即原子粒子，与大气中的气体分子碰撞造成的。
    根据第四段第二句可知，北极光穿过天空的速度通常足够慢，能够让人看到，但是它们可能也会跳动、闪烁，甚至会像波浪一样。由此可知，北极光移动的速度很慢，能够被人用眼观察，所以选择A项。
    最后一段表明，作者希望望人在一生中至少应该去看一次北极光，并且说他知道我们会感到难忘。可见作者对北极光是喜爱的，所以选择D项。

  • 第5题：

    共用题干
    第一篇
    The Northern Lights
    The sun is stormy and has its own kind of weather.It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour.These particles are called plasma （等离子体）,and the stream of plasma coming from the Sun is called the solar wind.The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth.When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into tile Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky.
    Each atmospheric gas glows a different color.Oxygen and nitrogen glows red and green arid nitrogen glows violet purple.As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras（北极光）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate（跳动）,flicker（闪烁）,or even move like waves.During solar maximum,5 auroras are seen as far south as Florida,even Mexico!Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly.A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime.We know you will never forget it!

    The Northern Lights are created when_______.
    A:the magnetic field lines fail to reconnect
    B:the electrons falling to the Earth shine in different colors
    C:atomic particles fall to the Earth and collide with atmospheric gas molecules
    D:oxygen and nitrogen are separated from the atmospheric gases

    答案：C
    解析：
    本篇文章主要介绍了北极光的形成、运动以及色彩。
    根据第一段第三、四句可知，热量在时速约100万英里的带电粒子流中由太阳向地球流动，这些粒子被称为等离子体，源于太阳的等离子体流又被称为太阳风。由此不难推测出，太阳风是能量从太阳向地球高速流动造成的，所以选择C项。
    根据第二段第三句可知，带电粒子被困在环绕地球的磁场中，并且根据第一段第三、四句以及第二段第一句可知，这些带电粒子即为太阳风。由此可知，太阳风吹向地球时，会被地球外围的磁场束缚住，所以选择A项。
    根据第二段最后一句可知，电子落向地球时与大气中的气体分子碰撞而产生了光芒；根据第三段第一句和第三句可知，碰撞后每种大气分子发出的光芒不同；不同的光芒在天空中闪现，造成了北极光和南极光；根据第二段第五句可知，原子粒子被称为电子。由此推出，北极光是由电子，即原子粒子，与大气中的气体分子碰撞造成的。
    根据第四段第二句可知，北极光穿过天空的速度通常足够慢，能够让人看到，但是它们可能也会跳动、闪烁，甚至会像波浪一样。由此可知，北极光移动的速度很慢，能够被人用眼观察，所以选择A项。
    最后一段表明，作者希望望人在一生中至少应该去看一次北极光，并且说他知道我们会感到难忘。可见作者对北极光是喜爱的，所以选择D项。

  • 第6题：

    判断题
    Migratory birds may rely on the earth’s magnetic field for guidance while traveling during cloudy days.
    A

    对

    B

    错


    正确答案： 错
    解析：
    逻辑推理和判断。录音中指出“On cloudy nights, they may be using the earth’s magnetic field…”，可知，多云的夜晚，迁徙的鸟类在飞行时会依靠地球磁场的指引，而非题干中所提到的during cloudy days。因此该题表述有误。
    【录音原文】
    Migratory birds use several ways to help them navigate. While traveling on a clear night they use the stars as guides. On cloudy nights, they may be using the earth’s magnetic field or the wind to help them navigate accurately. While flying during the day, the sun provides help for their precise flight.

  • 第7题：

    单选题
    The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.
    A

    north magnetic pole

    B

    south magnetic pole

    C

    magnetic prime vertical meridian

    D

    magnetic equator


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Geological evidence suggests that the earth’s magnetic polarity has switched back and forth many times over the millennia; such ______in the magnetic field may affect the ability of our planet to ward off cosmic radiation.
    A

    intensifications

    B

    justifications

    C

    records

    D

    correlations

    E

    fluctuations


    正确答案： E
    解析：
    地球的磁极在过去一千年不断地变换，即为磁极不断变动，fluctuation“变动；起伏”，故选E。correlation是“相关，关联”的意思。

  • 第9题：

    单选题
    During the transition of the Earth’s magnetic field _____.
    A

    the compass will become useless

    B

    man and animals will be confused as to directions

    C

    the magnetic strength of the Earth will disappear

    D

    the magnetic strength of the Earth will be stronger


    正确答案： A
    解析：
    第三段第四句开始：磁场的转换给人类和动物带来许多问题。宇航员和卫星会遇到很多困难，依靠磁场指示方向迁徙的鸟类、鱼类和其他动物会在迁徙中失去方向。

  • 第10题：

    单选题
    What is the basic principle of the magnetic compass（）.
    A

    Magnetic materials of the same polarity repel each other and those of opposite polarity attract

    B

    The Earth's magnetic lines of force are parallel to the surface of the Earth

    C

    Magnetic meridians connect points of equal magnetic variation

    D

    The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
    A

    hammering and jarring

    B

    vibration and pounding

    C

    varying magnetic fields

    D

    stable or permanent magnetism of the ship


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    The points on the earth’s surface where the magnetic dip is 90° are（）.
    A

    Along the magnetic equator

    B

    Connected by the isoclinal line

    C

    The isopors

    D

    The magnetic poles


    正确答案： C
    解析： 暂无解析

  • 第13题：

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    The Earth is quite safe with a magnetic field surrounding it to protect it from the attack by the solar wind.
    A: Right
    B: Wrong
    C: Not mentioned

    答案：A
    解析：
    题干意为“太阳的引力太弱，等离子体逃离太阳，流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索，在第一段中找到相关句： The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind．定位线索词集中出现在第一段中，因此重点关注第一段。第一段意为“太阳是多风暴的，有它自己独特的气候。太阳非常热，而且活动又极为剧烈，以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳，流向地球，时速高达100万英里。这些粒子叫等离子体，来自太阳的等离子流叫太阳风。太阳活动越剧烈，太阳风越强烈”。依据第一段的内容来看，等离子体逃离太阳的原因不是因为太阳的引力太弱，而是因为太阳非常热，活动又极为剧烈，由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全，因为有磁场在高空包围着地球，将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索，在第二段中找到相关句：The solar wind constantly streams toward the Earth，but don't worry because a protective magnetic field surrounds our planet（指地 球）.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet．定位线索词集中出现在第二段第一句中，因此重点关注该句。该句提到“太阳风不断地流向地球，但是不必担心，因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索，结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到，some scientists在短文中也没有出现，由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中，并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索，在第三段中找到相关句：The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights．定位线索词集中出现在第三段中，因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子，该原子粒子会被截留在磁场中，并最终落入地球两极的大气层中。等离子流的电子进入地球，与大气层的气体分子发生碰撞，在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光，氧和氮发红绿光，氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层，并与大气层的气体分子发生碰撞时，就会产出极光。题干句表达的意思与短文介绍的极光成因相符，所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大，否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索，在第四段中找 到相关句：Watching auroras (Northern Lights的近义词）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico！定位线索词集中在第四段中，因此重点关注这个段落，尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋，但是通常你只有在极北的地方，例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来，该段最后一句还提到“在太阳风暴达到最高峰的期间，明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”，由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索，结果发现短文中根本没有提到关于游客的信息，因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面，又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索，在短文中寻找相关句，同时因为题千中出现了修饰词 long , thick，也关注这两个修饰词在短文中的出现情况，这样在第五段中找到相关句：Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第14题：

    共用题干
    The Northern Lights
    The Sun is stormy and has its own kind of weather It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
    The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras is fun and exciting,but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida,even Mexico!
    Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

    The auroras are formed when the electrons falling into the Earth's atmosphere at the poles and colliding with gas molecules in the atmosphere.
    A: Right
    B: Wrong
    C: Not mentioned

    答案：A
    解析：
    题干意为“太阳的引力太弱，等离子体逃离太阳，流向地球”。利用题干中的细节信息词/短语the Sun's gravity, plasma, Earth作为定位线索，在第一段中找到相关句： The Sun is stormy and has its own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma,and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind．定位线索词集中出现在第一段中，因此重点关注第一段。第一段意为“太阳是多风暴的，有它自己独特的气候。太阳非常热，而且活动又极为剧烈，以至于太阳的引力也无法紧紧吸住它自己的大气层。热量以电粒子流的形式逃离太阳，流向地球，时速高达100万英里。这些粒子叫等离子体，来自太阳的等离子流叫太阳风。太阳活动越剧烈，太阳风越强烈”。依据第一段的内容来看，等离子体逃离太阳的原因不是因为太阳的引力太弱，而是因为太阳非常热，活动又极为剧烈，由此可见题干陈述的意义与短文内容不一致。所以答案为B。
    题干意为“地球相当安全，因为有磁场在高空包围着地球，将太阳风档在地球大气层外面”。利用题干中的细节信息词/短语the Earth, a magnetic field, attack by the solar wind作为定位线索，在第二段中找到相关句：The solar wind constantly streams toward the Earth，but don't worry because a protective magnetic field surrounds our planet（指地 球）.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and recon-fleet．定位线索词集中出现在第二段第一句中，因此重点关注该句。该句提到“太阳风不断地流向地球，但是不必担心，因为有一个保护性的磁场包围着我们的地球”。显然该句意义与题干意义一致。所以答案为A。
    题干意为“有些科学家担心包围地球起防护作用的磁场有一天会消失”。利 用题干中的细节信息短语some scientists, possible disappearance of the Earth's protective magnetic field, in the future作为定位线索，结果发现disappearance of the Earth's protective magnetic field在短文中根本没有提到，some scientists在短文中也没有出现，由此可知一些科学家是否在担心包围地球起防护作用的磁场有一天会消失是短文中未提及的信息。所以答 案为C。
    题干意为“当电子落入地球两极的大气层中，并与大气层中的气体分子碰 撞时就形成了极光”。利用题干中的细节信息词/短语auroras, electrons, Earth's atmos-phere, poles, gas molecule作为定位线索，在第三段中找到相关句：The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky. Each atmos- pheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights．定位线索词集中出现在第三段中，因此重点关注第三段。首先重点关注第三段的前两句。这两个句子说明“磁场磁力线的断开和闭合产生叫电子的原子粒子，该原子粒子会被截留在磁场中，并最终落入地球两极的大气层中。等离子流的电子进入地球，与大气层的气体分子发生碰撞，在天空中产生光芒”。接下来的句子提到 “每一种大气层的气体会产生不同颜色的光，氧和氮发红绿光，氮气发蓝紫光。当这些不同颜色的光在夜空中闪烁时就产生了北极光和南极光”。由此可见当等离子流的电子进入两极的大气层，并与大气层的气体分子发生碰撞时，就会产出极光。题干句表达的意思与短文介绍的极光成因相符，所以答案是A。
    题干意为“除非你在阿拉斯加州或是在加拿大，否则你看不见北极光”。利用题干中的细节信息词/短语Northern Lights, Alaska, Canada作为定位线索，在第四段中找 到相关句：Watching auroras (Northern Lights的近义词）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the auro- ra across the sky is usually slow enough to easily follow with your eyes but they can also pul- sate,flicker,or even move like waves.During solar maximum,auroras are seen as far south as Florida, even Mexico！定位线索词集中在第四段中，因此重点关注这个段落，尤其是该段第一句。该句意为“看北极光很有趣也很令人兴奋，但是通常你只有在极北的地方，例如在阿 拉斯加州和加拿大才能看见极光”。但是接下来，该段最后一句还提到“在太阳风暴达到最高峰的期间，明亮的北极光甚至在位于极南面的佛罗里达州甚至墨西哥都能看到”，由此可见 并非只有在阿拉斯加州或是在加拿大才能看见北极光。所以题干陈述的信息与短文内容不一 致。因此答案为B。
    题干意为“每年都会有上万游客专程前往娜威和瑞典观赏北极光”。利用题 干中的细节信息词/短语tens of thousands of tourists, special trips, Norway, Sweden, every year, Northern Lights作为定位线索，结果发现短文中根本没有提到关于游客的信息，因此题干中陈述的信息为短文中未提及的信息。所以答案为C。
    题干意为“极光通常很接近地面，又长又厚”。利用题干中的细节信息词/短语aurora , ground作为定位线索，在短文中寻找相关句，同时因为题千中出现了修饰词 long , thick，也关注这两个修饰词在短文中的出现情况，这样在第五段中找到相关句：Auro- ras often seem to be very close to the ground,but the lowest aurora is still about 100 kilome- ters above the ground,a distance much higher than clouds are f

  • 第15题：

    共用题干
    第一篇
    The Northern Lights
    The sun is stormy and has its own kind of weather.It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour.These particles are called plasma （等离子体）,and the stream of plasma coming from the Sun is called the solar wind.The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth.When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into tile Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky.
    Each atmospheric gas glows a different color.Oxygen and nitrogen glows red and green arid nitrogen glows violet purple.As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras（北极光）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate（跳动）,flicker（闪烁）,or even move like waves.During solar maximum,5 auroras are seen as far south as Florida,even Mexico!Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly.A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime.We know you will never forget it!

    What is the author's tone toward the Northern Lights?
    A:Indifferent.
    B:Sarcastic.
    C:Sharp.
    D:Appreciative.

    答案：D
    解析：
    本篇文章主要介绍了北极光的形成、运动以及色彩。
    根据第一段第三、四句可知，热量在时速约100万英里的带电粒子流中由太阳向地球流动，这些粒子被称为等离子体，源于太阳的等离子体流又被称为太阳风。由此不难推测出，太阳风是能量从太阳向地球高速流动造成的，所以选择C项。
    根据第二段第三句可知，带电粒子被困在环绕地球的磁场中，并且根据第一段第三、四句以及第二段第一句可知，这些带电粒子即为太阳风。由此可知，太阳风吹向地球时，会被地球外围的磁场束缚住，所以选择A项。
    根据第二段最后一句可知，电子落向地球时与大气中的气体分子碰撞而产生了光芒；根据第三段第一句和第三句可知，碰撞后每种大气分子发出的光芒不同；不同的光芒在天空中闪现，造成了北极光和南极光；根据第二段第五句可知，原子粒子被称为电子。由此推出，北极光是由电子，即原子粒子，与大气中的气体分子碰撞造成的。
    根据第四段第二句可知，北极光穿过天空的速度通常足够慢，能够让人看到，但是它们可能也会跳动、闪烁，甚至会像波浪一样。由此可知，北极光移动的速度很慢，能够被人用眼观察，所以选择A项。
    最后一段表明，作者希望望人在一生中至少应该去看一次北极光，并且说他知道我们会感到难忘。可见作者对北极光是喜爱的，所以选择D项。

  • 第16题：

    共用题干
    第一篇
    The Northern Lights
    The sun is stormy and has its own kind of weather.It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour.These particles are called plasma （等离子体）,and the stream of plasma coming from the Sun is called the solar wind.The more active the Sun,the stronger the solar wind.
    The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth.When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into tile Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky.
    Each atmospheric gas glows a different color.Oxygen and nitrogen glows red and green arid nitrogen glows violet purple.As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.
    Watching auroras（北极光）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate（跳动）,flicker（闪烁）,or even move like waves.During solar maximum,5 auroras are seen as far south as Florida,even Mexico!Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly.A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.
    We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime.We know you will never forget it!

    Which of the following statements is true of the Northern Lights?
    A:Their movement is slow enough to be observed with the eyes.
    B:People cannot see them unless traveling to Alaska or Canada.
    C:They are very close to the ground.
    D:They are very long and thick.

    答案：A
    解析：
    本篇文章主要介绍了北极光的形成、运动以及色彩。
    根据第一段第三、四句可知，热量在时速约100万英里的带电粒子流中由太阳向地球流动，这些粒子被称为等离子体，源于太阳的等离子体流又被称为太阳风。由此不难推测出，太阳风是能量从太阳向地球高速流动造成的，所以选择C项。
    根据第二段第三句可知，带电粒子被困在环绕地球的磁场中，并且根据第一段第三、四句以及第二段第一句可知，这些带电粒子即为太阳风。由此可知，太阳风吹向地球时，会被地球外围的磁场束缚住，所以选择A项。
    根据第二段最后一句可知，电子落向地球时与大气中的气体分子碰撞而产生了光芒；根据第三段第一句和第三句可知，碰撞后每种大气分子发出的光芒不同；不同的光芒在天空中闪现，造成了北极光和南极光；根据第二段第五句可知，原子粒子被称为电子。由此推出，北极光是由电子，即原子粒子，与大气中的气体分子碰撞造成的。
    根据第四段第二句可知，北极光穿过天空的速度通常足够慢，能够让人看到，但是它们可能也会跳动、闪烁，甚至会像波浪一样。由此可知，北极光移动的速度很慢，能够被人用眼观察，所以选择A项。
    最后一段表明，作者希望望人在一生中至少应该去看一次北极光，并且说他知道我们会感到难忘。可见作者对北极光是喜爱的，所以选择D项。

  • 第17题：

    单选题
    According to the passage, the Earth’s magnetic field has _____.
    A

    begun to change in the opposite direction

    B

    been weakening in strength for a long time

    C

    caused the changes on the polarities

    D

    misguided many a man and animal


    正确答案： C
    解析：
    文章第一段：《纽约时报》上周报导地球磁场严重减弱开始于150年前。磁场保护着我们的星球，为许多生物指引方向。

  • 第18题：

    单选题
    According to the experts, the reversal of the Earth’s magnetic field would _____.
    A

    destroy almost all the creatures on the Earth

    B

    cause some species extinctions on the Earth

    C

    not be as disastrous as the previous one

    D

    cause no big trouble for man and animals


    正确答案： A
    解析：
    第三段最后一句：但是专家说这种影响不会造成大的灾难，尽管世界末日之称以及一些不明确的证据把物种灭绝与上一次地球磁场转移相提并论。

  • 第19题：

    单选题
    If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE? （）
    A

    Compass error and variation are equal

    B

    Compass north will be true north

    C

    Variation will equal deviation

    D

    There will be no compass error


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）
    A

    The Flinders bar

    B

    The heeling magnet

    C

    Quadrantal soft iron spheres

    D

    Bar magnets in the binnacle


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    According to the passage, _____.
    A

    we should not worry about the transition of the Earth’s magnetic field

    B

    the Earth’s magnetic field will not change for at least 2000 years

    C

    the Earth’s magnetic field has decreased its strength rapidly

    D

    the transition of the Earth’s magnetic field can be controlled by modern science


    正确答案： C
    解析：
    第五段一开始：无论新的研究发现什么，公众也不必为此惊慌。即使是磁场转移已经开始，它可能需要2000年才能完成。

  • 第22题：

    单选题
    Permanent magnetism is caused by（）.
    A

    operation of electrical equipment and generators on board ship

    B

    the earth's magnetic field affecting the ship's hard iron during construction

    C

    the horizontal component of the earth's magnetic field acting on the horizontal soft iron

    D

    the vertical component of the earth's magnetic field acting on the vertical soft iron


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    Recent findings indicate that birds can also use the magnetic field of the earth as an aid to _____.
    A

    criterion

    B

    orientation

    C

    standard

    D

    guideline


    正确答案： D
    解析：
    句意：最新的研究成果显示鸟类也可以利用地球磁场来帮助自己定位。orientation方位。criterion标准。standard标准，规范。guideline指导方针。

  • 第24题：

    单选题
    The transition of the Earth’s magnetic field is possibly caused by _____.
    A

    the flows of melted iron inside the Earth

    B

    the periodical movement of the Earth

    C

    the mechanical energy of the solar system

    D

    the force coming from outer space


    正确答案： A
    解析：
    文章最后一段：谁也不能准确地知道为什么地球磁场会周期性转换，但是科学家说其原因可能在于地壳中融化了的铁的无序流动，它们看起来就像木星上组成云的气体一样。

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