单选题The reason why the laser beam is very strong is that ______.A it is artificially illuminatedB it is made up of a concentrated beam of lightC it sends out heat in all directionsD its heat is increased by the heat of the sun
题目
单选题
The reason why the laser beam is very strong is that ______.
A
it is artificially illuminated
B
it is made up of a concentrated beam of light
C
it sends out heat in all directions
D
its heat is increased by the heat of the sun
相似考题
参考答案和解析
正确答案：
D
解析：
事实细节题。由关键词why the laser beam is very strong定位第二段最后一句可知“能量被集中到一起而变得强大”。故答案为B项。
事实细节题。由关键词why the laser beam is very strong定位第二段最后一句可知“能量被集中到一起而变得强大”。故答案为B项。
更多“单选题The reason why the laser beam is very strong is that ______.A it is artificially illuminatedB it is made up of a concentrated beam of lightC it sends out heat in all directionsD its heat is increased by the heat of the sun”相关问题
-
第1题：
Spontaneous combustion is caused by ______．
A.An outside heat source heating a substance until it ignites
B.Conduction of heat through a wall of material to the substance
C.Chemical action within a substance
D.All of the above
正确答案：C
-
第2题：
共用题干
Heat Is Killer Extremely hot weather is common in many parts of the world.Although hot weather just makes most people feel hot,it can_______(51)serious medical problems-even death.Floods,storms,volcano eruptions and other natural______(52)kill thousands of people every year.
So______(53) extreme heat.Experts say heat may be nature's deadliest killer, Recently,extreme heat was blamed ______(54)killing more than one hundred people in India.It is reported that the total heat of a hot day or several days can______(55)health.Several hot days are considered a heat wave.
Experts say heat waves often become dangerous when the nighttime temperature does not_______(56)much from the highest daytime temperature.This causes great stress on the human body.
Doctors say people can do many things to______(57)themselves from the dangers of extreme heat. Stay out of the sun,if possible.Drink lots of cool water.Wear light colored clothing made______(58) natural materials;avoid wearing synthetic clothing.
Make sure the clothing is______(59),permitting freedom of movement.
And learn the danger______(60)of the medical problems,such as headache and vomiting,that are linked to heat.Most people suffer only muscle pain as a(n)______(61)of heat stress.The fiain is a______(62)that the body is becoming too hot.Doctors say those suffering headache or muscle pain should stop all activity,rest in a cool place and drink cool liquids.Do not return to physical _______(63)for a few hours because more serious conditions could develop.
Doctors say some people face an______(64)danger from heat stress.Such persons have a weak or damaged heart,high blood pressure,or other problems of the blood system.
Hot Weather also increases dangers for people who must take______(65)for high blood pressure, poor blood flow,nervousness or depression.64._________
A:impossible
B:incident
C:incredible
D:increased答案：D解析：该句意思是：别以为高温仅仅让人们感觉炎热，实际上它还会引发严重的疾病，甚至死亡。cause意思是“引起，造成”，符合句意。make制作；affect影响；form形成。
disasters意思是“灾难”, natural disasters意为“自然灾难”。前面的floods , storms,volcano eruptions都是自然灾害的具体表现，因此B项符合句意。pains疼痛；matters事件；experiences经历。
根据上文意思可知，该句意思是：极热天气更是如此。此处是倒装句，so+助动词+主语，表示主语一也这样。因为extreme heat为单数，所以助动词应用第三人称单数形式。
该句意思是：近来，印度有100多人死于极端高温天气。be blamed for为固定搭配，意思是“对……负有责任”，符合句意。
该句意思是：据报道，一天或几天里遭受持续高温的袭击将影响健康。affect意思是“影响”，符合句意。change改变；obtain获得；cause引起。
该句意思是：如果到夜晚没有降温，热浪是很危险的。drop意思是“下降”，符合句意。soar骤然上升；remove移动；meet遇见，满足。
protect…from…意思是“保护……免受……”，符合句意。keep/stop/prevent…from…阻止……发生。
该句意思是：要穿天然材料制作的衣服，不穿合成面料的服装。be made of意思是“由……制成”（看不出来原材料），符合句意。be made from由……制成（看得出来原材料）;be made in在……制作；be made for为……制作。
根据后半句意思可知，该句意思是：要确保衣服一定要宽松，以便活动自由。loose意思是“宽松的”，符合句意。tight绷紧的；large大的；small小的。
该句意思是：了解高温引发疾病的危险信号，比如头疼、呕吐。signs意思是“信号”，符合句意。designs设计；traits特点；points观点。
该句意思是：大多数人遭受高温仅会感到肌肉疼痛。as a result of为固定搭配，意思是“作为……的结果”，符合句意。
该句意思是：疼痛是对你身体温度过高的警告。warning意思是“警告”，符合句意。inference推理，推断；need需要；guidance指导。
该句意思是：几个小时内都不要再进行体力活动，否则还会导致更严重的状况。activity意思是“活动”, physical activity意为“体力活动”，符合句意。act行为，行动；action行动；acting演戏。
该句意思是：医生指出，一些人面对高温天气的危险又增加了。increased意思是“增多的，增加的”，符合句意。impossible不可能的；incident偶然的；incredible难以置信的。
该句意思是：炎热天气对于那些必须服药以控制高血压等的人也增加了危险。take medicine意思是“服药”，符合句意。take food吃东西；take water喝水；take meal吃饭。 -
第3题：
共用题干
How the Body Keeps the Same Temperature
The temperature of your body should always be the same if you are fine,no matter whether the weather
is hot or cold.That is why the doctor tests your temperature with a thermometer when you are sick.Normally,
your body teniperature is ninety-eight point six degrees Fahrenheit.If it is_______(51)than that,it is a
stire sign that something is wrong with your body.
Your body keeps the same temperature all the time,because it balances the heat it produces and the
heat it_______(52)off. It is always burning up food and producing heat.It can produce heat faster
when the body needs or give off heat faster when the body becomes too warm.Let's see_______(53)
this works.
The heat of your body is given off chiefly through the skin.When you feel_______(54),your skin
is tight and shows"goose flesh".When you feel chilly,you must_______(55)around to keep warm.
_______(56)your muscles begin to work,bum up fuel and produce more heat.It is not_______(57)to
shiver,so you usually prefer warming up by taking exercise,or put_______(58)more clothes to keep
warm。
When you get warm,the skin is loose and soft. It is so supplied_______(59)blood that heat is giv-
en off rapidly. If you get too warm,you begin to sweat and_______(60)body heat is used in evaporating
the, moisture in your body.In warm_______(61)or warm rooms,you wear less clothing,
_______ (62)heat can be given off freely. You prefer less exercise because your body is warm_______(63),and
the extra heat produced by taking too much exercise makes you uncomfortable.
Now you see why you_______(64)differently in different kinds of weather. In summer,when it is
hot,you feel tired and lazy.You do not care to work or play,but enjoy lying down and doing nothing. When
you get out of door in winter,the cold air makes you feel_______(65).You want to run and play._________(53)
A:how
B:when
C:what
D:why答案：A解析：前面的内容讲的是，体温要保持一定的稳定性，人的身体才会健康。由此可推断，体温过高或过低都说明人的身体出现了问题。结合选项可知选D。
give off意为“发出，放出（气味、热等）";put off意为“推迟”;show off意为“炫耀”;keep off意为“使……远离”。结合句意应选A。
前面简单提到我们的身体需要热量的时候就能产生热量，我们的身体变得太暖和的时 候就会很快地释放热量。根据上下文可知，这里是一个过渡的句子，意为“让我们看看这是怎 么工作的”。故选A。
结合常识可知，当你感到冷的时候，会起鸡皮疙瘩。因此选D。
make做；eat吃；work工作；jump跳。这里说的是如果你感到很冷，你必须要跳来跳去 来取暖。故选D。
前面提到跳来跳去来取暖，那么接着肌肉就开始工作了。then表示“接着”，符合句意。
结合常识可知，颤抖是不令人愉快的，且后面的句子中有prefer，因此应选B。
put on意为“穿上”，符合句意。
supply with意为“提供……”，为固定搭配，符合句意。
more更多的；enough足够的；many很多little很少。此句意为：更多的身体热量用来蒸 发身体里的水分。因此选A。
weather天气；climate气候；circumstance条件，状况；environment环境。结合句意应 选A。
or否则；so that以便；but但是；and和。结合句意应选B。
本句的意思是：你喜欢少运动是因为你的身体足够的暖和。因此选C。
根据后面讲的夏天和冬天的感受可知，这里应选feel,
结合上下文的意思可知，夏天人们喜欢躺在床上什么也不做，而在冬天人们通过运动 来取暖。由此可知，在冬天人们显得生机勃勃。 -
第4题：
单选题The rate of heat transfer from a hot region to a cold region is affected most by the （）.Asize of the heat sink
Btemperature difference between the regions
Csize of the heat source
Dtotal heat of the system
正确答案： C解析： 暂无解析 -
第5题：
填空题Our atmosphere absorbs the heat the ground emits and sends some of it back to the Earth.____正确答案： C解析：
根据题干信息“our atmosphere”可以定位到C段“our atmosphere does the same thing—it absorbs the heat that the ground emits and sends some of it back to the Earth”，大气也在做同样的事——吸收地面的热量，然后再把一部分返回到地面，故匹配段落为C。 -
第6题：
单选题It is required that such insulator (绝热体)．______a heat resistant material.Amust be made of
Bshould be made of
Cwill be made of
Dwould be made of
正确答案： D解析： -
第7题：
问答题Practice 1 Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______ 2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body. 3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively. 4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you. 5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.[A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.[B] The second factor is the amount of water vapor in the air－the humidity.[C] Hot windy days are much more comfortable than hot still days.[D] This heat transfer occurs even if the environment is hotter than the body.[E] When air moves over the surface of water, the amount of evaporation is greatly increased.[F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.[G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.正确答案： 1.D 空前说“出汗能散热是因为液体蒸发的时候可以带走周围大量的热量。所以当我出汗时,大量的热量被从身体表面吸走了”。D项说“即使周围温度笔体温高时,热量传递也是可以进行的”。符合逻辑关系。故选D。
2.G 根据关键词“the first,the second”可知,本段讲的是两大因素。G项说“影响汗水蒸发的因素有两个”。符合逻辑关系。故选G。
3.E 本段讲的是空气流动情况下汗水的蒸发状况。E项说“当空气在水的表面流动时,蒸发量大为增加”。符合文意。故选E。
4.B 本段讲的是湿度对蒸发的影响。故选B。
5.A 倒数第二段说“当湿度是100%时,蒸发就不能进行了”。最后一段说“在这种情况下,蒸发速度很快”。说明空处讲的是湿度很低的情况。故选A。解析： 暂无解析 -
第8题：
单选题Which of the following is true of the heating system of the Johnstown campus?AThe heat is supplied by human bodies only.
BThe heat is supplied by both human bodies and other heat-emitting objects.
CThe heat is supplied by both human bodies and conventional fuel.
DThe heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
正确答案： A解析： -
第9题：
单选题The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.Afusion
Bvaporization
Ccondensation
Dsublimation
正确答案： C解析： 暂无解析 -
第10题：
单选题We learn from the passage that ______.Aall living things on the earth depend on the sun for their food
Ba forest looks dark in winter because it absorbs solar energy
Conly 0.023 of the energy from the sun is made use of on the earth
Dgreenhouse gases allow heat energy to escape from the earth’ s surface
正确答案： A解析：
根据第一段Sunlight also provides the energy used by green plants to make their own food，阳光给绿色植物提供能量使其生产自己的食物，故选A。 -
第11题：
单选题Which of the following statements is correct concerning heat transfer?（）AHeat is given off from a high temperature region known as a heat sink
BHeat transfer rate is affected most by the size of the heat sink involved
CHeat transfer rate is affected most by the temperature difference between the heat source and the heat sink
DHeat transfer by radiation will occur only by mass motion of a fluid substance
正确答案： D解析： 暂无解析 -
第12题：
共用题干
Heat Is Killer Extremely hot weather is common in many parts of the world.Although hot weather just makes most people feel hot,it can_______(51)serious medical problems-even death.Floods,storms,volcano eruptions and other natural______(52)kill thousands of people every year.
So______(53) extreme heat.Experts say heat may be nature's deadliest killer, Recently,extreme heat was blamed ______(54)killing more than one hundred people in India.It is reported that the total heat of a hot day or several days can______(55)health.Several hot days are considered a heat wave.
Experts say heat waves often become dangerous when the nighttime temperature does not_______(56)much from the highest daytime temperature.This causes great stress on the human body.
Doctors say people can do many things to______(57)themselves from the dangers of extreme heat. Stay out of the sun,if possible.Drink lots of cool water.Wear light colored clothing made______(58) natural materials;avoid wearing synthetic clothing.
Make sure the clothing is______(59),permitting freedom of movement.
And learn the danger______(60)of the medical problems,such as headache and vomiting,that are linked to heat.Most people suffer only muscle pain as a(n)______(61)of heat stress.The fiain is a______(62)that the body is becoming too hot.Doctors say those suffering headache or muscle pain should stop all activity,rest in a cool place and drink cool liquids.Do not return to physical _______(63)for a few hours because more serious conditions could develop.
Doctors say some people face an______(64)danger from heat stress.Such persons have a weak or damaged heart,high blood pressure,or other problems of the blood system.
Hot Weather also increases dangers for people who must take______(65)for high blood pressure, poor blood flow,nervousness or depression.61._________
A:influence
B:result
C:effect
D:view答案：B解析：该句意思是：别以为高温仅仅让人们感觉炎热，实际上它还会引发严重的疾病，甚至死亡。cause意思是“引起，造成”，符合句意。make制作；affect影响；form形成。
disasters意思是“灾难”, natural disasters意为“自然灾难”。前面的floods , storms,volcano eruptions都是自然灾害的具体表现，因此B项符合句意。pains疼痛；matters事件；experiences经历。
根据上文意思可知，该句意思是：极热天气更是如此。此处是倒装句，so+助动词+主语，表示主语一也这样。因为extreme heat为单数，所以助动词应用第三人称单数形式。
该句意思是：近来，印度有100多人死于极端高温天气。be blamed for为固定搭配，意思是“对……负有责任”，符合句意。
该句意思是：据报道，一天或几天里遭受持续高温的袭击将影响健康。affect意思是“影响”，符合句意。change改变；obtain获得；cause引起。
该句意思是：如果到夜晚没有降温，热浪是很危险的。drop意思是“下降”，符合句意。soar骤然上升；remove移动；meet遇见，满足。
protect…from…意思是“保护……免受……”，符合句意。keep/stop/prevent…from…阻止……发生。
该句意思是：要穿天然材料制作的衣服，不穿合成面料的服装。be made of意思是“由……制成”（看不出来原材料），符合句意。be made from由……制成（看得出来原材料）;be made in在……制作；be made for为……制作。
根据后半句意思可知，该句意思是：要确保衣服一定要宽松，以便活动自由。loose意思是“宽松的”，符合句意。tight绷紧的；large大的；small小的。
该句意思是：了解高温引发疾病的危险信号，比如头疼、呕吐。signs意思是“信号”，符合句意。designs设计；traits特点；points观点。
该句意思是：大多数人遭受高温仅会感到肌肉疼痛。as a result of为固定搭配，意思是“作为……的结果”，符合句意。
该句意思是：疼痛是对你身体温度过高的警告。warning意思是“警告”，符合句意。inference推理，推断；need需要；guidance指导。
该句意思是：几个小时内都不要再进行体力活动，否则还会导致更严重的状况。activity意思是“活动”, physical activity意为“体力活动”，符合句意。act行为，行动；action行动；acting演戏。
该句意思是：医生指出，一些人面对高温天气的危险又增加了。increased意思是“增多的，增加的”，符合句意。impossible不可能的；incident偶然的；incredible难以置信的。
该句意思是：炎热天气对于那些必须服药以控制高血压等的人也增加了危险。take medicine意思是“服药”，符合句意。take food吃东西；take water喝水；take meal吃饭。 -
第13题：
共用题干
How the Body Keeps the Same Temperature
The temperature of your body should always be the same if you are fine,no matter whether the weather
is hot or cold.That is why the doctor tests your temperature with a thermometer when you are sick.Normally,
your body teniperature is ninety-eight point six degrees Fahrenheit.If it is_______(51)than that,it is a
stire sign that something is wrong with your body.
Your body keeps the same temperature all the time,because it balances the heat it produces and the
heat it_______(52)off. It is always burning up food and producing heat.It can produce heat faster
when the body needs or give off heat faster when the body becomes too warm.Let's see_______(53)
this works.
The heat of your body is given off chiefly through the skin.When you feel_______(54),your skin
is tight and shows"goose flesh".When you feel chilly,you must_______(55)around to keep warm.
_______(56)your muscles begin to work,bum up fuel and produce more heat.It is not_______(57)to
shiver,so you usually prefer warming up by taking exercise,or put_______(58)more clothes to keep
warm。
When you get warm,the skin is loose and soft. It is so supplied_______(59)blood that heat is giv-
en off rapidly. If you get too warm,you begin to sweat and_______(60)body heat is used in evaporating
the, moisture in your body.In warm_______(61)or warm rooms,you wear less clothing,
_______ (62)heat can be given off freely. You prefer less exercise because your body is warm_______(63),and
the extra heat produced by taking too much exercise makes you uncomfortable.
Now you see why you_______(64)differently in different kinds of weather. In summer,when it is
hot,you feel tired and lazy.You do not care to work or play,but enjoy lying down and doing nothing. When
you get out of door in winter,the cold air makes you feel_______(65).You want to run and play._________(61)
A:weather
B:climate
C:circumstance
D:environment答案：A解析：前面的内容讲的是，体温要保持一定的稳定性，人的身体才会健康。由此可推断，体温过高或过低都说明人的身体出现了问题。结合选项可知选D。
give off意为“发出，放出（气味、热等）";put off意为“推迟”;show off意为“炫耀”;keep off意为“使……远离”。结合句意应选A。
前面简单提到我们的身体需要热量的时候就能产生热量，我们的身体变得太暖和的时 候就会很快地释放热量。根据上下文可知，这里是一个过渡的句子，意为“让我们看看这是怎 么工作的”。故选A。
结合常识可知，当你感到冷的时候，会起鸡皮疙瘩。因此选D。
make做；eat吃；work工作；jump跳。这里说的是如果你感到很冷，你必须要跳来跳去 来取暖。故选D。
前面提到跳来跳去来取暖，那么接着肌肉就开始工作了。then表示“接着”，符合句意。
结合常识可知，颤抖是不令人愉快的，且后面的句子中有prefer，因此应选B。
put on意为“穿上”，符合句意。
supply with意为“提供……”，为固定搭配，符合句意。
more更多的；enough足够的；many很多little很少。此句意为：更多的身体热量用来蒸 发身体里的水分。因此选A。
weather天气；climate气候；circumstance条件，状况；environment环境。结合句意应 选A。
or否则；so that以便；but但是；and和。结合句意应选B。
本句的意思是：你喜欢少运动是因为你的身体足够的暖和。因此选C。
根据后面讲的夏天和冬天的感受可知，这里应选feel,
结合上下文的意思可知，夏天人们喜欢躺在床上什么也不做，而在冬天人们通过运动 来取暖。由此可知，在冬天人们显得生机勃勃。 -
第14题：
In stowage, keep nylon rope away （）heat and strong chemicals.
- A、from
- B、to
- C、with
- D、at
正确答案:A -
第15题：
单选题Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to（）.Areduce electrolytic action on heat exchanger metals
Bkeep heat transfer surfaces shiny and clean
Cprevent rapid accumulation of marine growth
Dprovide a protective coating on heat exchanger surfaces
正确答案： A解析： 暂无解析 -
第16题：
单选题The heat gained per pound of refrigerant in the evaporator is known as the（）.Alatent heat of vaporization
Bsensible heat
Crefrigerating effect
Dspecific heat of vaporization
正确答案： B解析： 暂无解析 -
第17题：
单选题In stowage, keep nylon rope away （）heat and strong chemicals.Afrom
Bto
Cwith
Dat
正确答案： A解析： 暂无解析 -
第18题：
单选题The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.Aremain constant along the tubes length
Bbe greatest in a single pass counter flow heat exchanger
Cremain constant throughout the heat exchanger
Dvary from section to section through out the heat exchanger
正确答案： D解析： 暂无解析 -
第19题：
单选题The heat used to change a liquid to a vapor is called （）.Alatent heat of fusion
Blatent heat of vaporization
Cspecific heat of vaporization
Dlatent heat of the gas
正确答案： D解析： 暂无解析 -
第20题：
单选题The amount of heat released by steam when it changes to water at the same temperature is called（）.Alatent heat of condensation
Blatent heat of vaporization
Clatent heat of saturation
Dsensible heat of condensation
正确答案： C解析： 暂无解析 -
第21题：
单选题“The use of a poor quality oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in turn results in a considerable reduction in heat transfer with subsequent overheating and thermal cracking” According to this sentence, we can know that the principle reason of the overheating and thermal cracking is（）Athe use of a poor quality oil
Bthe deterioration of its properties
Cthe formation of deposits
Dthe reduction in heat transfer ability
正确答案： B解析： 暂无解析 -
第22题：
单选题A refrigerant gives up heat when it goes through （）.Acondenser
Bregurgitate
Cevaporator
Dboil coil
正确答案： B解析： 暂无解析