In cold, damp weather, the buildup of ice on airplane wings can pose significant aerodynamic problems. Which of the following effects would you expect?A.As ice builds up on the top of the wing, drag increases.B.As ice builds up on the top of the wing, lif

题目

In cold, damp weather, the buildup of ice on airplane wings can pose significant aerodynamic problems. Which of the following effects would you expect?

A.As ice builds up on the top of the wing, drag increases.

B.As ice builds up on the top of the wing, lift increases.

C.As ice builds up on bottom of the wing, lift decreases.

D.All of the above


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更多“In cold, damp weather, the buildup of ice on airplane wings can pose significant aerodynamic problems. Which of the following effects would you expect?A.As ice builds up on the top of the wing, drag increases.B.As ice builds up on the top of the wing, lif”相关问题
  • 第1题:

    You are on an ice-reinforced vessel about to enter packice.You should ______.

    A.enter the pack on the windward side where there is a well defined ice edge

    B.trim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcement

    C.take maximum advantage of coastal leads caused by offshore winds

    D.look for areas of rotten ice and enter perpendicular to the ice edge


    正确答案:D

  • 第2题:

    You should have put the milk into the ice box, I expect it ____undrinkable by now.

    A.became
    B.had become
    C.has become
    D.becomes

    答案:C
    解析:
    本题考查时间状语从句
    C选项,句意:你本该把牛奶放到冰里,我想现在这牛奶不能喝了。从句意分析,牛奶已经变质,不能喝了,属过去发生的动作对现在造成影响,再加上by now是现在完成时的典型时间状语,故选C项。
    A选项,为一般过去时,与题意不符,故排除。
    B选项,为过去完成时,故排除。
    D选项,为一般现在时,与题干不符,故排除。
    故正确答案为C 项。

  • 第3题:

    共用题干
    Rainmaking
    1 The idea of rainmaking is almost as old as man,but it was not until 1946 that man succeeded in making rain.In ancient times,rainmakers had claimed to bring rain by many methods:dancing.singing-Kiiiing animals t including humans).
    2 For a long time,men have understood where rain comes from.Water from the surface of oceans and lakes becomes part of the air,where it forms clouds from which rain falls.But exactly what starts the formation of raindrops was not known until quite recently.A man named John Aitken proved that drops of water gather around tiny bits of dust or other matter.The centers of the drops are so small that the human eye cannot see them.Without such centers,it seems raindrops do not form.
    3 During World War Ⅱ,Dr.Irving Langmir,and his assistant Schaefer,were hired by the General Electric Company to study how and why ice forms on the wings of airplanes.They went to a mountain in New Hampshire,where snowstorms are common and cold winds blow.They were surprised to find that often the temperature of the clouds surrounding them was far below the freezing point,and yet ice did not form in the clouds.
    4 After the War,Schaefer experimented with a machine that created cold,moist air similar to the air found in clouds.To imitate the moist air of a cloud,Schaefer would breathe into the machine.Then he would drop into the freezer a bit of powder,sugar,or some other substance.For weeks and months he tried everything he could imagine.Nothing happened.No crystals of ice were formed.None of the substances would serve as the center of a snow crystal or raindrops.
    5 One July morning,Schaefer was dropping in bits of various substances and watching the unsuccessful results.Finally,a friend suggested that they go to eat lunch and Schaefer went with him.As usual,he left the cover of the freezer up,since cold air sinks and would not escape from the box.
    6 Returning from lunch,Schaefer found that the temperature of the freezer had risen to a point higher than that required for ice crystals to remain solid.There were two choices now.He could close the cover and wait for the freezer itself to lower the air temperature,or he could make the process occur faster by adding dry ice-a gas in solid form that is very,very cold.He chose the latter plan.As he dropped the steaming white dry ice into the freezer,he happened to breathe out a large amount of air.And there,before his eyes,it happened!He had made ice crystals,not by adding centers to the moisture,but by cooling the breath so much that the liquid had to form crystals!Then he began to blow his breath into the freezer and drop large pieces of dry ice through it to create crystals which became a tiny snowstorm falling slowly to the floor of his laboratory.
    7 After planning carefully,Schaefer made an experiment by dropping dry ice from his plane to the clouds below him.As was expected,snow formed and fell from the bottom of the cloud.Schaefer succeeded.He made history.

    Schaefer found a way of how to make ice crystals______.
    A:imaginatively
    B:recently
    C:carefully
    D:unscientifically
    E:accidentally
    F:satisfactorily

    答案:E
    解析:
    本段简要地叙述了人们所掌握的关于雨水的来源和形成的知识。
    本段介绍了Langmir和Schaefer受雇于通用电气公司(GeneralElectricCompany),研究机翼结冰的原因。
    本段描述了Schaefer进行的人工制造冰晶体的实验,但这些实验均没有成功。
    由文章第六段“Ashedroppedthesteamingwhitedryiceintothefreezer,hehappenedto...theliquidhadtoformcrystals!”可知,一次偶然的机会,Schaefer在投入干冰以降低温度的时候,呼出一大口气,结果冰晶体却出现了,他在无意中发现了制造冰晶体的方法。
    文章第一段中提到“Inancienttimes,rainmakershadclaimedtobringrain坊manymethods:dancing,singing,killinganimals(includinghumans).",该句中所列的作为造雨、求雨的方法如dancing,singing,killinganimals(includinghumans)等都是不科学的。
    答题的解释请参阅第26题的说明。
    由文章第七段“Afterplanningcarefully,Schaefermadeanexperimentbydroppingdryicefronhisplanetothecloudsbelowhim.Aswasexpected,snowformedandfellfromthebottomofthecloud.Schaefersucceeded.”可知,Schaefer经过仔细的计划,成功地进行了一次实验,故选C。
    由文章第四段可知,Schaefer是在二战以后才开始研究人工降雨;又由最后一段可知:他创历史地成功进行了人工降雨。由此可知,人类直到最近才成功进行人工降雨,故选B。

  • 第4题:

    共用题干
    第一篇

    Arctic Melt

    Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
    in the Arctic Ocean(北冰洋)fell to a record low.
    Normally,ice builds in Arctic waters around the North Pole each winter and shrinks(缩小)during the
    summer. But for many years,the amount of ice left by the end of summer has been declining.
    Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
    2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
    Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
    shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
    time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
    This continuing trend has made scientists concerned.
    There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer(海洋学家)at the
    University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
    pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
    Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
    sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
    Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
    record high.
    With both air and water getting warmer,the ice is melting from both above and below. In some parts of
    the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
    of the summer measured just 50 centimeters by season's end.
    The new measurements suggest that melting is far more severe than scientists have seen by just looking
    at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
    and Engineering Laboratory in Hanover,N.H.
    Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.

    By the end of summer 2007 the ice cover in the Arctic was ________.
    A:4.2 million square kilometers
    B:11.4 million square kilometers
    C:1.13 million square kilometers
    D:38 million square kilometers

    答案:A
    解析:
    build在此处是“增长,扩大”的意思。expand有“扩张”的意思,所以与build含义相符。
    根据第四段第二句可知答案。
    第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因:一为强风,二为较少的云。
    短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
    短文最后一句提到,一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。

  • 第5题:

    共用题干
    第一篇

    Arctic Melt

    Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
    in the Arctic Ocean(北冰洋)fell to a record low.
    Normally,ice builds in Arctic waters around the North Pole each winter and shrinks(缩小)during the
    summer. But for many years,the amount of ice left by the end of summer has been declining.
    Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
    2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
    Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
    shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
    time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
    This continuing trend has made scientists concerned.
    There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer(海洋学家)at the
    University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
    pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
    Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
    sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
    Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
    record high.
    With both air and water getting warmer,the ice is melting from both above and below. In some parts of
    the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
    of the summer measured just 50 centimeters by season's end.
    The new measurements suggest that melting is far more severe than scientists have seen by just looking
    at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
    and Engineering Laboratory in Hanover,N.H.
    Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.

    The Beaufort Sea mentioned in Paragraph 7 is an example to show_________.
    A:how acetirate the new measurements are
    B:how thick the ice is in it
    C:how serious the problem of the ice melt in the Arctic is
    D:how dangerous it is to travel to it

    答案:C
    解析:
    build在此处是“增长,扩大”的意思。expand有“扩张”的意思,所以与build含义相符。
    根据第四段第二句可知答案。
    第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因:一为强风,二为较少的云。
    短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
    短文最后一句提到,一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。

  • 第6题:

    共用题干
    第一篇

    Arctic Melt

    Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
    in the Arctic Ocean(北冰洋)fell to a record low.
    Normally,ice builds in Arctic waters around the North Pole each winter and shrinks(缩小)during the
    summer. But for many years,the amount of ice left by the end of summer has been declining.
    Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
    2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
    Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
    shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
    time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
    This continuing trend has made scientists concerned.
    There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer(海洋学家)at the
    University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
    pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
    Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
    sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
    Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
    record high.
    With both air and water getting warmer,the ice is melting from both above and below. In some parts of
    the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
    of the summer measured just 50 centimeters by season's end.
    The new measurements suggest that melting is far more severe than scientists have seen by just looking
    at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
    and Engineering Laboratory in Hanover,N.H.
    Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.

    Which of the following is closest in meaning to the word"build"in the first sentence of thesecond paragraph?
    A:Construct.
    B:Establish.
    C:Create.
    D:Expand.

    答案:D
    解析:
    build在此处是“增长,扩大”的意思。expand有“扩张”的意思,所以与build含义相符。
    根据第四段第二句可知答案。
    第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因:一为强风,二为较少的云。
    短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
    短文最后一句提到,一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。

  • 第7题:

    地面测试机翼防冰系统工作时:()

    • A、机翼防冰电门必须 AUTO 位,P61板上的WING ANTI-ICE WINDOW/PROBE HEAT电门WING ANTI-ICE 位
    • B、机翼防冰电门必须ON 位,P61板上的WING ANTI-ICE WINDOW/PROBE HEAT电门WING ANTI-ICE 位
    • C、机翼防冰电门必须ON 位,P61板上的WING ANTI-ICE WINDOW/PROBE HEAT电门任意位
    • D、机翼防冰电门必须 OFF 位,P61板上的WING ANTI-ICE WINDOW/PROBE HEAT电门WING ANTI-ICE 位

    正确答案:D

  • 第8题:

    若在地面上,将防冰面板上WING接通会怎么样()

    • A、大翼防冰打开
    • B、大翼防冰不可接通
    • C、启动30秒测试程序
    • D、大翼防冰不打开,但ECAM备忘信息显示WING.ANTI.ICE.ON

    正确答案:C

  • 第9题:

    单选题
    We can infer from the passage_______.
    A

    the ice can easily just slip into the ocean

    B

    volcanoes caused the ice to melt

    C

    melting just in the Northern hemisphere would have been impossible

    D

    researchers often use the computer models help their research work


    正确答案: A
    解析:

  • 第10题:

    单选题
    The author of the passage would be most likely to agree with which of the following statements about the Milankovitch theory?
    A

    It is the only possible explanation for the ice ages.

    B

    It is too limited to provide a plausible explanation for the ice ages, despite recent research findings.

    C

    It cannot be tested and confirmed until further research on volcanic activity is done.

    D

    It is one plausible explanation, though not the only one, for the ice ages.

    E

    It is not a plausible explanation for the ice ages, although it has opened up promising possibilities for future research.


    正确答案: E
    解析:
    推断题。最后一段第一句指出:…it is important to note that other factors…could potentially have affected the climate,可知虽然作者认为Milankovitch理论为冰淇提供了一种解释,但是它并不是唯一的,故D项的叙述是正确的。

  • 第11题:

    单选题
    You are in a tropical port. The refrigeration machinery on a container loaded with air-cooled fruit fails. It cannot be repaired for 18 to 24 hours. Which step should you take to reduce the temperature rise and spoilage of the fruit?().
    A

    Discharge a cylinder of nitrogen into the container

    B

    Shade the container and periodically hose it down

    C

    Seal any ventilation openings and add dry ice

    D

    Spread ice over the top layer and in any voids within the container


    正确答案: B
    解析: 暂无解析

  • 第12题:

    单选题
    According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?
    A

    They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.

    B

    They are less reliable than the evidence from rocks on land in determining the volume of land ice.

    C

    They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.

    D

    They are more unpredictable during an ice age than in other climatic conditions.

    E

    They can be used to determine atmospheric conditions at various times in the past.


    正确答案: A
    解析:
    细节题。第二段第二句指出:relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments,故可知洋底的氧同位素比例可以用来推算形成时陆冰的体积,故本题应选C项。

  • 第13题:

    You are in a tropical port.The refrigeration machinery on a container loaded with air-cooled fruit fails.It cannot be repaired for 18 to 24 hours.Which step should you take to reduce the temperature rise and spoilage of the fruit ________.

    A.Discharge a cylinder of nitrogen into the container

    B.Shade the container and periodically hose it down

    C.Seal any ventilation openings and add dry ice

    D.Spread ice over the top layer and in any voids within the container


    正确答案:B

  • 第14题:

    资料:A high-precision NASA radar instrument left a NASA airport in Southern California for Iceland on January 28 to create detailed maps of how glaciers move in the dead of winter. This will help scientists around the world better understand some of the most basic processes involved in melting glaciers, which are major contributors to rising sea levels.
    NASA used the same airborne instrument in June 2012 to map the summer flows of two Icelandic ice caps. The ice caps — large areas of permanent snow and ice cover — encompass multiple glaciers flowing in different directions and at different speeds. By mapping the same ice caps now, in winter, when the surface remains frozen all day, and then comparing the winter and summer velocities, the researchers will be able to isolate the effects of melt water.
    Above is a view of a small part of the Hofsjkull ice cap, which encompasses several glaciers. The fan at upper left is part of a glacier called Mlaj?kull.
    For more on the research, see this NASA press release.

    How can the scientists figure out the effects of melting water?

    A.By melting the frozen iceberg in winter.
    B.By observing the snow's moving directions.
    C.By isolating ice from water in sunlines.
    D.By comparing the glaciers moving speeds.

    答案:D
    解析:
    本题考查的是细节理解。
    【关键词】how; the scientists; figure out effects; melting water
    【主题句】第2自然段By mapping the same ice caps now, in winter, when the surface remains frozen all day, and then comparing the winter and summer velocities, the researchers will be able to isolate the effects of melt water. 通过勘察相同的冰盖,在冬天,当表面保持冷冻一整天,然后比较冬天和夏天的速度,研究人员将能够分离融水的影响。
    【解析】本题的问题是“科学家们怎样才能弄清楚融化水的作用呢?”。选项A意为“通过冬天融化冰山”;选项B意为“通过观察雪的移动方向”;选项C意为“通过在太阳线下隔离水中的冰”;选项D意为“通过比较冰川的移动速度”。
    根据主题句可知,科学家们通过对比冰川在夏天和冬天的移动速度来弄清楚融化水的作用,故选D。

  • 第15题:

    共用题干
    Rainmaking

    1 The idea of rainmaking is almost as old as man,but it was not until 1946 that man succeeded in
    making rain.In ancient times,rainmakers had claimed to bring rain by many methods:dancing,singing,
    killing animals(including humans).
    2 For a long time,men have understood where rain comes from.Water from the surface of oceans and
    lakes becomes part of the air,where it forms clouds from which rain falls.But exactly what starts the forma-
    tion of raindrops was not known until quite recently.A man named John Aitken proved that drops of water
    gather around tiny bits of dust or other matter. The centers of the drops are so small that the human eye can-
    not see them.Without such centers,it seems raindrops do not form.
    3 During World War Ⅱ,Dr. Irving Langmir,and his assistant Schaefer,were hired by the General
    Electric Company to study how and why ice forms on the wings of airplanes.They went to a mountain in New
    Hampshire,where snowstorms are common and cold winds blow. They were surprised to find that often the
    temperature of the clouds surrounding them was far below the freezing point,and yet ice did not form in the
    clouds.
    4 After the War,Schaefer experimented with a machine that created cold,moist air similar to the air
    found in clouds.To imitate the moist air of a cloud.Schaefer would breathe into the machine.Then he
    would drop into the freezer a bit of powder,sugar,or some other substance.For weeks and months he tried
    everything he could imagine.Nothing happened.No crystals of ice were formed.None of the substances
    would serve as the center of a snow crystal or raindrops.
    5 One July morning,Schaefer was dropping in bits of various substances and watching the unsuccessful
    results.Finally,a friend suggested that they go to eat lunch and Schaefer went with him.As usual,he left
    the cover of the freezer up,since cold air sinks and would not escape from the box.
    6 Returning from lunch,Schaefer found that the temperature of the freezer had risen to a point higher
    than that required for ice crystals to remain solid.There were two choices now.He could close the cover and
    wait for the freezer itself to lower the air temperature,or he could make the process occur faster by adding dry
    ice a gas in solid form that is very,very cold.He chose the latter plan.As he dropped the steaming white
    dry ice into the freezer,he happened to breathe out a large amount of air. And there,before his eyes,it
    happened ! He had made ice crystals,not by adding centers to the moisture,but by cooling the breath so
    much that the liquid had to form crystals!Then he began to blow his breath into the freezer and drop large
    pieces of dry ice through it to create crystals which became a tiny snowstorm falling slowly to the floor of his
    laboratory.
    7 After planning carefully,Schaefer made an experiment by dropping dry ice from his plane to the
    clouds below him.As was expected,snow formed and fell from the bottom of the cloud.Schaefer succeeded.
    He made history.

    Schaefer found a way of how to make ice crystals_________.
    A:imaginatively
    B:recently
    C:carefully
    D:unscientifically
    E:accidentally
    F:satisfactorily

    答案:E
    解析:
    本段简略地叙述了雨水的来源和形成雨滴的核心部分。
    本段介绍了Langmir和Schaefer受雇于通用电气公司(General Electric Company),研究 机翼结冰的成因。
    本段描述了Schaefer从事的人工制造冰晶体的实验,但没有成功。
    由文章第六段“As he dropped the steaming white dry ice into the freezer, he happened to breathe out。large amount of air",可知一次偶然的机会,Schaefer在投人干冰的时候,呼出一大 口气,结果冰晶体却出现了。他在无意中发现了制造冰晶体的方法。
    在文章第一段中提到“In ancient times, rainmakers had claimed to bring rain by many methods: dancing, singing, killing animals (including humans)"。该句中提到的作为造雨、求雨 的手段的dancing, singing, killing animals (including humans)等都是不科学的方法。
    答题的解释请参阅第26题的说明。
    由文章第七段“After planning carefully, Schaefer made an experiment by dropping dry ice from his plane to the clouds below him.As was expected,snow formed and fell from the bottom of the cloud.Schaefer succeeded",可知选C。
    由文章第二段“But exactly what starts the formation of raindrops was not known until quite recently",可知选B。第4部分:阅读理解第一篇 本篇文章主要讲述了食用土豆对人体免疫系统的益处。

  • 第16题:

    共用题干
    第一篇

    Arctic Melt

    Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
    in the Arctic Ocean(北冰洋)fell to a record low.
    Normally,ice builds in Arctic waters around the North Pole each winter and shrinks(缩小)during the
    summer. But for many years,the amount of ice left by the end of summer has been declining.
    Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
    2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
    Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
    shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
    time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
    This continuing trend has made scientists concerned.
    There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer(海洋学家)at the
    University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
    pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
    Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
    sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
    Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
    record high.
    With both air and water getting warmer,the ice is melting from both above and below. In some parts of
    the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
    of the summer measured just 50 centimeters by season's end.
    The new measurements suggest that melting is far more severe than scientists have seen by just looking
    at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
    and Engineering Laboratory in Hanover,N.H.
    Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.

    It can be learned from the last sentence that _________.
    A:the ice melt in the Arctic may never stop
    B:scientists are trying hard to stop the ice melt in the Arctic
    C:scientists are delighted to find out what is going on in the Arctic
    D:the warming trend in the Arctic can be reversed in the near future

    答案:A
    解析:
    build在此处是“增长,扩大”的意思。expand有“扩张”的意思,所以与build含义相符。
    根据第四段第二句可知答案。
    第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因:一为强风,二为较少的云。
    短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
    短文最后一句提到,一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。

  • 第17题:

    共用题干
    第一篇

    Arctic Melt

    Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
    in the Arctic Ocean(北冰洋)fell to a record low.
    Normally,ice builds in Arctic waters around the North Pole each winter and shrinks(缩小)during the
    summer. But for many years,the amount of ice left by the end of summer has been declining.
    Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
    2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
    Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
    shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
    time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
    This continuing trend has made scientists concerned.
    There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer(海洋学家)at the
    University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
    pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
    Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
    sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
    Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
    record high.
    With both air and water getting warmer,the ice is melting from both above and below. In some parts of
    the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
    of the summer measured just 50 centimeters by season's end.
    The new measurements suggest that melting is far more severe than scientists have seen by just looking
    at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
    and Engineering Laboratory in Hanover,N.H.
    Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.

    What are the reasons for the ice melting according to the scientists?
    A:Strong winds and clear skits.
    B:Longer summers and shorter winters.
    C:Open water and thin ice.
    D:Heavy clouds and light winds.

    答案:A
    解析:
    build在此处是“增长,扩大”的意思。expand有“扩张”的意思,所以与build含义相符。
    根据第四段第二句可知答案。
    第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因:一为强风,二为较少的云。
    短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
    短文最后一句提到,一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。

  • 第18题:

    在可结冰的状态下起飞或着陆,下列哪些电门要接通?

    • A、ENG IGNITION,ENG ANTICE,WING/TAI ANTICE
    • B、ENG ANTICE,WING/TAI ANTICE,ICE DET
    • C、ENG ANTICE,WING/TAI ANTICE
    • D、以上全不正确

    正确答案:B

  • 第19题:

    “WING A ICE”在机翼防冰活门按扭至于“ON”位时显示()

    • A、绿色;
    • B、白色;
    • C、琥珀色;
    • D、兰色

    正确答案:A

  • 第20题:

    单选题
    The scientists are not sure_______.
    A

    how long the ice age lasted

    B

    where ice sheets melted during the ice age

    C

    what caused the temperature changes

    D

    what the earth is made up of


    正确答案: D
    解析:

  • 第21题:

    单选题
    You are on an ice-reinforced vessel about to enter packice. You should().
    A

    enter the pack on the windward side where there is a well defined ice edge

    B

    trim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcement

    C

    take maximum advantage of coastal leads caused by offshore winds

    D

    look for areas of rotten ice and enter perpendicular to the ice edge


    正确答案: D
    解析: 暂无解析

  • 第22题:

    填空题
    The gold seekers could climb up the Chilkoot Pass, thanks to the steps carved into the ice.____

    正确答案: E
    解析:
    根据题于中的“Chilkoot Pass”定位到E段。本段讲到,有了冰上开凿的梯级,掘金者才能通过the Chilkoot Pass。故匹配段落为E段。

  • 第23题:

    单选题
    Which of the following is the best title for the passage ?
    A

    A computer model

    B

    Studies show ice melted equally in the North and the South during the ice age

    C

    Most of the ice melted in the Northern hemisphere during the 30,000-year long ice age

    D

    A survey result


    正确答案: B
    解析: