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共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. Howeve

题目
共用题干
Learn about Light
1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.
2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.
3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.
4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.
5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.

Paragraph 5______
A: How Is the Nature of Light Explained Today?
B: What Are Sources of Light?
C: How Did Physicists Measure the Speed of Light?
D: How Does Light Travel?
E: How Did People Think of Light Years Ago?
F: What Causes a Shadow?
参考答案和解析
答案：C
解析：
该概括大意与完成句子所选的阅读材料为记述文，段落主题相对于论述文而言较松散，因此记述文中的段落大意往往需要考生根据自己的理解而归纳概括出来。解答概括大意题的技巧往往派不上用场。第二段主要讲述现代科学家认同了爱因斯坦的光电效应理论。因此可以判断A选项“当今人们如何解释光的性质”正确。
第三段第一句“Things that give off light are known as sources of light.”就点明主旨，发光的物体是光源。所以B选项“什么是光源？”正确。
第四段主要讲述光传播的问题，所以D选项“光是如何传播的”正确。
第五段的关键字是speed of light，光速。所以C选项“物理学家如何测量光的速度”正确。
题干意为“人们可以看见物体是因为光……。“从第二段最后一句可知，人们看见物体是因为光是一种能量。所以F项a form of energy正确的。
题干意为“星星、火焰、手电筒都是……的例子。”第三段“Other sources of light include stars , flames , flashlights...”说明，这些都是光源的例子。所以A选项sourcesof light是正确的。
题干意为“某些情况下，如反射和吸收可以改变……。”第四段中“there are some instances that can change the path and even the nature of light.They are reflection,ab-sorption , interference , etc.”这说明有一些情况可以改变光的路径。所以C选项the path of light是正确的。
题干意为“Hippolyte Fizeau做了一个刚试……的实验。”文中最后一段 “Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror...he was able to calculate that the speed of light...”可知Hippolyte Fizeau通过实验计算出了光速。所以B选项是正确的。
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相似问题和答案

第1题：

Why do the American doctors think of using laser light to treat heart disease?

A．Beeause laser light is quite powerful．

B．Because laser light is penetrating．

C．Because laser light can destroy the blocking materials in human’s artery．

D．Because laser light can travel through the human body．


正确答案：C
根据文章第二段开头一句，可知激光能够清除动脉里的脂肪物质，因此答案应是C项。

第2题：

共用题干
Dreams

Everyone can dream. Indeed,everyone does dream. Those who_________(51)that they never dream at
all actually dream_________(52)as frequently as the rest of us,______(53)they may not remember
anything about it. Even those of us who are perfectly_________(54)of dreaming night after night very
seldom remember those dreams in_________(55)detail but merely retain an untidy mixture of seemingly
unrelated _________（56).Dreams are not simply visual一we dream with all our_________(57),so that we
appear to experience sound,touch,smell,and taste.
One of the world's oldest_________(58)written documents is the Egyptian Book of Dreams.This
volume is about five thousand years old,so you can see_________(59)dreams were believed to have a special
significance even then. Many ancient civilizations believed that you_________（60）never wake a sleeping person
as,during sleep,the soul had left the body and might not be able to return_________(61)time if the sleeper
were suddenly awoken.
From ancient times to the present_________(62),people have been making attempts to interpret
dreams and to_________(63)their significance. There are many books available on the_________(64)of
dream interpretation,although unfortunately there are almost as many meanings for a particular dream
_________(65)there are books.

_________(53)
A:though
B:besides
C:however
D:despite

答案：A
解析：
单词claim意思是“断言，宣称”，表示在没有证据的情况下做出某种论断，符合题意。
本题的四个选项中also和only常放置在谓语动词的前面；quite常用来修饰形容词，表 示“很……”，故选B。这里，just as frequently as…意思为“正和……一样频繁”。
此空应该用表示转折意义的词。第三句大意为：那些自称不做梦的人其实正和其他人 一样频繁做梦，只是他们可能记不起来了。单词besides表示“而且”; however虽表示转折，但 其后常使用逗号连接；despite表示“虽然”，但是其后常跟诸如fact之类的名词，故选A
短语be aware of是固定搭配，意思为“意识到，知道”，这里表示“知道自己夜夜做梦”, 符合题意。
短语in great detail意思为“非常详细地”，符合题意。其他选项都不与detail一词构成 搭配，故选A。
单词impression意思为“印象”; condition意思为“条件，状况”; vision意思为“视力，景 象”; collection意思为“收集”。四个选项中只有C项符合题意，在句子中表示人们只能记住模 糊、看起来不相关的景象，故选C。
effort意思为“努力”; sense意思为“感官，感觉”; taste意思为“味觉，滋味”; word表示 “词语，字”。四个选项中只有B项符合题意，表示“我们做梦时所有的感官都在起作用”，故 选B。
单词known意思为“被人知道的，知名的”; considered意思为“被考虑的”; regarded意 思为“被视为……，被留意的”; estimated意思为“估计的，预计的”。四个选项中只有A项符合 题意，此句的意思为“世界上最老的、被人们熟知的文字记载……”，故选A。
此空及其后内容是see的宾语部分，因此应选C，即以that引导宾语从句。
单词would接动词原形表示某种趋势或者依据安排要发生的事情；C、D两项需要后加 to表示“应该……；有必要……”，故选B。
短语in time意思为“及时”，故选A。
单词day在这里表示“时日，时期”，其他各项均无此意，故选D。
单词study作动词意思为“研究，学习”; attach意思为“连接，认为有”; reach意思为“到 达，达到”; explain意思为“解释”，因此应选D，表示“人们试图解析梦，并解释其重要性”。
单词subject意思为“主题，科目”;fact意思为“事实”; major意思为“专业”; impact意思 为“影响”，因此应选A，表示“有许多有关梦的解析主题的书”。
固定短语as…as意思为“和……一样”，本句的意思为“……对梦的意思的解析和相关 主题的书一样多”，故选C。

第3题：

Passage One

Long time ago, the ancient people could not travel to any far away places for they had no vehicle to carry them across the wide oceans, deep valleys, long rivers or high mountains.

Nowadays people take advantage of steamships, trains, airplanes and modern bridges. Airplanes can carry us to the far countries in a short time; steamships can travel across the wide oceans. It is convenient to the modern people.

Travelling is a good idea to us because we can get more knowledge, such as the customs, the geography of other countries. And people could travel among the different countries in the world. For it is easy to travel from the land by trains, or from the sea by ships.

We learnt that the Italian who made the world large was Mr. Columbus. He was a brave man. Up to the middle of the 15th century, the people were afraid of traveling because they believed it was a dangerous thing.

There is a saying in China, which is "Travelling for thousands is better than reading for ten years." It is to say that we can learn more in different places than we can learn from books.

36. The people in ancient times couldn't travel too far away places because______.

A. they found it no use doing so

B. they liked staying at home

C. there was no modern transportation

D. they were forbidden to go to other countries


正确答案：C

此题为细节题。见在第一段内the ancient people could not travel to any faraway places for they had no instruments说明古人出游不能离家太远作长途旅行的原因；没有现代的交通工具。

第4题：

共用题干
第三篇

Small but Wise

On December 14,NASA blasted a small but mighty telescope into space.The telescope is called WISE
and is about as wide around as a trashcan.Don't let its small size fool you:WISE has a powerful digital
camera,and it will be taking pictures of some of the wildest objects in the known universe,including
asteroids,faint stars,blazing galaxies and giant clouds of dust where planets and stars are born.
"I'm very excited because we're going to be seeing parts of the universe that we haven't seen be-
fore,"said Ned Wright,a scientist who directs the WISE project.
Since arriving in space,the WISE telescope has been circling the Earth,held by gravity in a polar orbit
(this means it crosses close to the north and south poles with each lap).Its camera is pointed outward,away
from the Earth,and WISE will snap a picture of a different part of the sky every 11 minutes.After six months
it will have taken pictures across the entire sky.
The pictures taken by WISE won't be like everyday digital photographs,however. WISE stands for
"Wide-field Infrared Survey Explorer".As its name suggests,the WISE camera takes pictures of features
that give off infrared radiation.
Radiation is energy that travels as a wave.Visible light,including the familiar spectrum of light that be-
comes visible in a rainbow,is an example of radiation.When an ordinary digital camera takes a picture of a
tree,for example,it receives the waves of visible light that are reflected off the tree.When these waves enter
the camera through the lens,they're processed by the camera,which then puts the image together.
Waves of infrared radiation are longer than waves of visible light,so ordinary digital cameras don't see
them,and neither do the eyes of human beings.Although invisible to the eye,longer infrared radiation can
be detected as warmth by the skin.
That's a key idea to why WISE will be able to see things other telescopes can't. Not everything in the
universe shows up in visible light.Asteroids,for example, are giant rocks that float through space一but they
absorb most of the light that reaches them.They don't reflect light,so they're difficult to see.But they do
give off infrared radiation,so an infrared telescope like WISE will be able to produce images of them.During
its mission WISE will take pictures of hundreds of thousands of asteroids.
Brown dwarfs are another kind of deep-space objects that will show up in WISE's pictures.These ob-
jects are "failed" stars一which means they are not massive enough to jump-start the same kind of reactions
that power stars such as the sun.Instead,brown dwarfs simply shrink and cool down.They're so dim that
they're almost impossible to see with visible light,but in the infrared spectrum they glow.

Which of the following statements about asteroids is NOT true?
A:The WISE telescope can catch and take pictures of them.
B:They do not reflect light that reaches them.
C:They float through space giving off visible light.
D:They are invisible to ordinary cameras.

答案：C
解析：
由文章前两段内容可知，这个太空望远镜携带的数码相机可以拍到我们未知的宇宙里 的众多物体，它将使人类看到宇宙中的未知部分，故选C。
这个太空望远镜其实是个广视场红外线探测器（Wide-field Infrared Survey Explorer)，它 能拍到产生红外线辐射的物体，故选B。
由文章第六段内容可知，红外线辐射波比可见光的波长更长，因此普通的相机和肉眼 都是看不到它们的，但是红外线波可由皮肤感知，故本题选D。
由文章第七段第二、三句“Not everything in the universe shows up in visible light.Asteroids , for example...”可知，不是所有的物体都是以可见光的形式被发现的，小行星就是一 例，它们发出红外线，太空望远镜WISE可以感测到，故选C。
由最后一段内容可知，棕矮星能够被WISE探测到，说明它们发射的光不是可见光，而 是红外线波，故选A。

第5题：

共用题干
Learn about Light
1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.
2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.
3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.
4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.
5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.

Paragraph 3______
A: How Is the Nature of Light Explained Today?
B: What Are Sources of Light?
C: How Did Physicists Measure the Speed of Light?
D: How Does Light Travel?
E: How Did People Think of Light Years Ago?
F: What Causes a Shadow?

答案：B
解析：
该概括大意与完成句子所选的阅读材料为记述文，段落主题相对于论述文而言较松散，因此记述文中的段落大意往往需要考生根据自己的理解而归纳概括出来。解答概括大意题的技巧往往派不上用场。第二段主要讲述现代科学家认同了爱因斯坦的光电效应理论。因此可以判断A选项“当今人们如何解释光的性质”正确。
第三段第一句“Things that give off light are known as sources of light.”就点明主旨，发光的物体是光源。所以B选项“什么是光源？”正确。
第四段主要讲述光传播的问题，所以D选项“光是如何传播的”正确。
第五段的关键字是speed of light，光速。所以C选项“物理学家如何测量光的速度”正确。
题干意为“人们可以看见物体是因为光……。“从第二段最后一句可知，人们看见物体是因为光是一种能量。所以F项a form of energy正确的。
题干意为“星星、火焰、手电筒都是……的例子。”第三段“Other sources of light include stars , flames , flashlights...”说明，这些都是光源的例子。所以A选项sourcesof light是正确的。
题干意为“某些情况下，如反射和吸收可以改变……。”第四段中“there are some instances that can change the path and even the nature of light.They are reflection,ab-sorption , interference , etc.”这说明有一些情况可以改变光的路径。所以C选项the path of light是正确的。
题干意为“Hippolyte Fizeau做了一个刚试……的实验。”文中最后一段 “Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror...he was able to calculate that the speed of light...”可知Hippolyte Fizeau通过实验计算出了光速。所以B选项是正确的。

第6题：

Based on the laser operation treatment of three patients。what can we infer from the passage?

A．Laser light treatment is safe and effective．

B．Laser light treatment is dangerous and ineffective

C．Laser light treatment still requires much more studies．

D．Government should encourage doctors to do research of laser light treatment on the human body．


正确答案：D
通读文章第一段，根据第二段后半部分，特别是最后两句，可知正确的推断应是D项。

第7题：

共用题干
Learn about Light
1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.
2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.
3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.
4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.
5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.

Hippolyte Fizeau conducted an experiment to measure______.
A: sources of light
B: the speed of light
C: the path of light
D: a straight line
E: a beam of light
F: a form of energy

答案：B
解析：
该概括大意与完成句子所选的阅读材料为记述文，段落主题相对于论述文而言较松散，因此记述文中的段落大意往往需要考生根据自己的理解而归纳概括出来。解答概括大意题的技巧往往派不上用场。第二段主要讲述现代科学家认同了爱因斯坦的光电效应理论。因此可以判断A选项“当今人们如何解释光的性质”正确。
第三段第一句“Things that give off light are known as sources of light.”就点明主旨，发光的物体是光源。所以B选项“什么是光源？”正确。
第四段主要讲述光传播的问题，所以D选项“光是如何传播的”正确。
第五段的关键字是speed of light，光速。所以C选项“物理学家如何测量光的速度”正确。
题干意为“人们可以看见物体是因为光……。“从第二段最后一句可知，人们看见物体是因为光是一种能量。所以F项a form of energy正确的。
题干意为“星星、火焰、手电筒都是……的例子。”第三段“Other sources of light include stars , flames , flashlights...”说明，这些都是光源的例子。所以A选项sourcesof light是正确的。
题干意为“某些情况下，如反射和吸收可以改变……。”第四段中“there are some instances that can change the path and even the nature of light.They are reflection,ab-sorption , interference , etc.”这说明有一些情况可以改变光的路径。所以C选项the path of light是正确的。
题干意为“Hippolyte Fizeau做了一个刚试……的实验。”文中最后一段 “Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror...he was able to calculate that the speed of light...”可知Hippolyte Fizeau通过实验计算出了光速。所以B选项是正确的。

第8题：

What can we learn about the design of the "Case Study House"?

A．Mechanical devices were widely used.

B．Natural scenes were taken into consideration.

C．Details were sacrificed for the overall effect.

D．Eco-friendly materials were employed.


正确答案：B
解析：细节题。题干中的“Case Study House”定位在最后一段，并且该词在最后一段重复出现，题干没有明确的定位。因此需要选项回原文一一对应。

第9题：

共用题干
Learn about Light
1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.
2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.
3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.
4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.
5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.

Objects are visible to the human eye as light is______.
A: sources of light
B: the speed of light
C: the path of light
D: a straight line
E: a beam of light
F: a form of energy

答案：F
解析：
该概括大意与完成句子所选的阅读材料为记述文，段落主题相对于论述文而言较松散，因此记述文中的段落大意往往需要考生根据自己的理解而归纳概括出来。解答概括大意题的技巧往往派不上用场。第二段主要讲述现代科学家认同了爱因斯坦的光电效应理论。因此可以判断A选项“当今人们如何解释光的性质”正确。
第三段第一句“Things that give off light are known as sources of light.”就点明主旨，发光的物体是光源。所以B选项“什么是光源？”正确。
第四段主要讲述光传播的问题，所以D选项“光是如何传播的”正确。
第五段的关键字是speed of light，光速。所以C选项“物理学家如何测量光的速度”正确。
题干意为“人们可以看见物体是因为光……。“从第二段最后一句可知，人们看见物体是因为光是一种能量。所以F项a form of energy正确的。
题干意为“星星、火焰、手电筒都是……的例子。”第三段“Other sources of light include stars , flames , flashlights...”说明，这些都是光源的例子。所以A选项sourcesof light是正确的。
题干意为“某些情况下，如反射和吸收可以改变……。”第四段中“there are some instances that can change the path and even the nature of light.They are reflection,ab-sorption , interference , etc.”这说明有一些情况可以改变光的路径。所以C选项the path of light是正确的。
题干意为“Hippolyte Fizeau做了一个刚试……的实验。”文中最后一段 “Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror...he was able to calculate that the speed of light...”可知Hippolyte Fizeau通过实验计算出了光速。所以B选项是正确的。

第10题：

共用题干
第三篇

Small but Wise

On December 14,NASA blasted a small but mighty telescope into space.The telescope is called WISE
and is about as wide around as a trashcan.Don't let its small size fool you:WISE has a powerful digital
camera,and it will be taking pictures of some of the wildest objects in the known universe,including
asteroids,faint stars,blazing galaxies and giant clouds of dust where planets and stars are born.
"I'm very excited because we're going to be seeing parts of the universe that we haven't seen be-
fore,"said Ned Wright,a scientist who directs the WISE project.
Since arriving in space,the WISE telescope has been circling the Earth,held by gravity in a polar orbit
(this means it crosses close to the north and south poles with each lap).Its camera is pointed outward,away
from the Earth,and WISE will snap a picture of a different part of the sky every 11 minutes.After six months
it will have taken pictures across the entire sky.
The pictures taken by WISE won't be like everyday digital photographs,however. WISE stands for
"Wide-field Infrared Survey Explorer".As its name suggests,the WISE camera takes pictures of features
that give off infrared radiation.
Radiation is energy that travels as a wave.Visible light,including the familiar spectrum of light that be-
comes visible in a rainbow,is an example of radiation.When an ordinary digital camera takes a picture of a
tree,for example,it receives the waves of visible light that are reflected off the tree.When these waves enter
the camera through the lens,they're processed by the camera,which then puts the image together.
Waves of infrared radiation are longer than waves of visible light,so ordinary digital cameras don't see
them,and neither do the eyes of human beings.Although invisible to the eye,longer infrared radiation can
be detected as warmth by the skin.
That's a key idea to why WISE will be able to see things other telescopes can't. Not everything in the
universe shows up in visible light.Asteroids,for example, are giant rocks that float through space一but they
absorb most of the light that reaches them.They don't reflect light,so they're difficult to see.But they do
give off infrared radiation,so an infrared telescope like WISE will be able to produce images of them.During
its mission WISE will take pictures of hundreds of thousands of asteroids.
Brown dwarfs are another kind of deep-space objects that will show up in WISE's pictures.These ob-
jects are "failed" stars一which means they are not massive enough to jump-start the same kind of reactions
that power stars such as the sun.Instead,brown dwarfs simply shrink and cool down.They're so dim that
they're almost impossible to see with visible light,but in the infrared spectrum they glow.

It is true that infrared radiation_________.
A:is not detectable to humans
B:looks brighter than visible light
C:is visible light reflected off an object
D:has longer waves than those of visible light

答案：D
解析：
由文章前两段内容可知，这个太空望远镜携带的数码相机可以拍到我们未知的宇宙里 的众多物体，它将使人类看到宇宙中的未知部分，故选C。
这个太空望远镜其实是个广视场红外线探测器（Wide-field Infrared Survey Explorer)，它 能拍到产生红外线辐射的物体，故选B。
由文章第六段内容可知，红外线辐射波比可见光的波长更长，因此普通的相机和肉眼 都是看不到它们的，但是红外线波可由皮肤感知，故本题选D。
由文章第七段第二、三句“Not everything in the universe shows up in visible light.Asteroids , for example...”可知，不是所有的物体都是以可见光的形式被发现的，小行星就是一 例，它们发出红外线，太空望远镜WISE可以感测到，故选C。
由最后一段内容可知，棕矮星能够被WISE探测到，说明它们发射的光不是可见光，而 是红外线波，故选A。

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