阅读理解 Light travels at a speed which is about a million times faster than that of sound. In one second, light travels about 300,000 kilometers, but sound travels only 340 meters. You can get some idea 题目和参考答案——青夏教育精英家教网—

阅读理解

　　Light travels at a speed (速度) which is about a million times faster than that of sound. In one second, light travels about 300,000 kilometers, but sound travels only 340 meters. You can get some idea of this difference by watching the start of a running match. If you stand quite far away from the starter (发令员), you can see smoke come from his gun before the sound reaches your ears.

　　The fast speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays (射线) left the moon 1. 3 seconds before they reached you. The nearest star is so far away that light which you can see from it tonight started to travel to you 4 years ago at a speed of nearly 2 million kilometers every minute. The light from some of tonight's started on its journey towards you even before you were born.

　　So, if we want to be honest (诚实的), we can not say, “The stars are shining brightly tonight.” We have to say. “The stars look nice. They were shining four years ago but their light has just reached our earth.”

1．The best title of this passage is ________.

[　　]

A．Light Travels Faster Than Sound

B．Stars Are Far Away From Us

C．The Speed of Light

D．How Light Rays Travel

2．If you stand 200 meters away from a man who is lifting a gun to

start a running match, you will find out ________.

[　　]

A．light travels a million times faster than sound

B．the smoke of the gun gets into your sight after the sound of the gun-shot

C．sound travels less fast than light

D．the sound of the gun reached you at the same time with the light of the smoke

3．Sunlight obviously (明显的) ________ than the light of the moon.

[　　]

A．has to travel a greater distance (距离)

B．moves less quickly

C．travels much more quickly

D．is less powerful

4．The scientific way of saying ``The stars are shining brightly tonight" should be ________.

[　　]

A．the stars have been shining all the time

B．the stars seen tonight will be shining four years later

C．the stars which were shining long ago but are seen tonight

D．the starlight seen tonight could be seen four years ago

5．The light of the nearest star you see tonight has been ________ for years.

[　　]

A．on the earth

B．on the moon

C．away from the sun

D．away from itself

答案：C;C;A;C;D

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根据短文内容，选择正确答案

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阅读短文。选择正确答案。

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