全国英语等级考试（二级）
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
it is artificially illuminated
it is made up of a concentrated beam of light
it sends out heat in all directions
its heat is increased by the heat of the sun
相似问题和答案
第1题：
To get some idea of the amount of heat the sun ________(1), think about this. If you ________(2)collect all the heat that hits the earth in a two-week period, it would equal the amount of all the other known sources and reserves of energy: wood, coal, and oil. But even these sources of energy depend ________(3) the sun for their formation. For example, a tree ________ (4) certainly never grow and provide fuel in the form. of wood were it not for the sun. Because the sun is so important in the production of all forms of heating fuel, more and more time and money are being spent ________(5) ways to change power from the sun directly into a form. of heat.
1.
A、gives off
B、turns off
C、takes off
D、sets off
2.
A、will
B、could
C、must
D、shall
3.
A、of
B、in
C、on
D、to
4.
A、will
B、must
C、shall
D、would
5.
A、study
B、studied
C、studying
D、being studying
第2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
第3题：
C
Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are full of black surfaces already, in the form. of asphalt (柏油) roads?
Ten years ago, this thought came into the mind of Arian de Bondt, a Dutch engineer. He finally persuaded his boss to follow it up. The result is that their building is now heated in winter and cooled in summer by a system that relies on the surface of the road outside.
The heat-collector is a system of connected water pipes. Most of them run from one side of the street to the other, just under the asphalt road. Some, however, dive deep into the ground.
When the street surface gets hot in summer, water pumped through the pipes picks up this heat and takes it underground through one of the diving pipes. At a depth of 100 metres lies a natural aquifer (蓄水层) into which several heat exchangers (交换器) have been built. The hot water from the street runs through these exchangers, warming the ground-water, before returning to the surface through another pipe. The aquifer is thus used as a heat store.
In winter, the working system is changed slightly. Water is pumped through the heat exchangers to pick up the heat stored during summer. This water goes into the building and is used to warm the place up. After performing that task, it is pumped under the asphalt and its remaining heat keeps the road free of snow and ice.
64. Which of the following is true according to the first two paragraphs?
A. Arian de Bondt got his idea from his boss.
B. Large, flat, black surfaces need to be built in cities.
C. The Dutch engineer's system has been widely used.
D. Heat can also be collected from asphalt roads.
第4题：
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.
A:how
B:when
C:what
D:why
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5题：
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.
A:impossible
B:incident
C:incredible
D:increased
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6题：
A.focus on
B.pay attention to
C.concentrate on
D.lay stress on
解析：focus on 聚焦;pay attention to，注意，留心;concentrate on，注意力集中;lay stress on 强调。根据句子的意思，应该是光线的聚焦，所以选A。
第7题：
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.
A:influence
B:result
C:effect
D:view
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8题：
For what purpose are the diving pipes used?
A. To absorb heat from the sun.
B. To store heat for future use.
C. To turn solar energy into heat energy.
D. To carry heat down below the surface.
第9题：
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.
A:weather
B:climate
C:circumstance
D:environment
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10题：
In stowage, keep nylon rope away （）heat and strong chemicals.
- A、from
- B、to
- C、with
- D、at
正确答案:A