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The speed _____ light travels is very high.

题目
单选题
The speed _____ light travels is very high.
A

which

B

at which

C

in which

D

with which

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相似问题和答案

第1题：

The African way of communication sent messages______.

A. in a special way

B. over a very short distance

C. by a musical instrument

D. at a rather slow speed


正确答案：C

53．答案为C  鼓为一种乐器，所以本题答案为C。

第2题：

Light travels at about ___.

A.300,000 kilometres a second

B.a second 300,000 kilometres

C.every second 300,000 kilometres

D.300,000 kilometre every second


正确答案：A

第3题：

A: It’s good of you to see me.B:_________. I have heard a lot about your company.

A.Good things, I hope.

B.News travels fast in the toy industry.

C.Not at all.

D.They are very impressive.


参考答案：C

第4题：

A light siglinal consisting of three flashes means ______.

A.I an in doubt as to your actions

B.My engines are full speed astern

C.I desire to overtake you

D.I am operating astern propulsion


正确答案：D
由三闪组成的灯光信号，表示我船正在后退。

第5题：

The computer works very fast, _________ data at the speed of light.

A.having handled

B.handling

C.handled

D.handles


正确答案:B 

第6题：

Heavy objects and light objects () at the same speed.

A、falls

B、fall

C、fallen

D、falling


参考答案：B

第7题：

The light from the sun moves away from its source in all directions, so its strength is very () .

A.broken out

B.spread out

C.looked out

D.figured out


正确答案：B
解析：broken out 爆发;spread out 分散;looked out 小心;figured out 搞清楚根据句子的意思，应该是光线的分散，所以选择B. 

第8题：

The computer, working very fast, _________data at the speed of light.

A． handles

B． handling

C． handled

D． has handled


正确答案：A
本句考查动词时态。handles为一般现在时第三人称单数形式，表习惯性动作、现在的能力和特征或状态等；handling是现在分词不能单独作谓语；handled为一般过去时形式，表过去某时发生的动作或情况等；has handled为现在完成时，强调以前发生的动作对现在的影响。题干的意思是：“这种计算机运行很快，其数据处理的速度达到了光速。”

第9题：

The speed of radio waves is equal to ________of light.

A. those

B. that

C. the one

D. the ones


正确答案：B 

第10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。

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