Light travels（傳播）at a speed which is about a million times faster than the speed of sound.In one second,light travels about 300,000 km,but sound travels only 344m.You can get some idea of this difference by watching the start of a race（比賽）.If you stand some distance away from the starter,you can see smoke come from his gun before the sound reaches your ears.This great speed of light produces（產(chǎn)生）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（光線）left the moon 1.3 seconds

before they reached you.

The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute.In some cases（在某種情況下）the light from one of tonight's stars started on its journey to you before you were born.

Thus,if we want to be honest,we cannot say "The stars are shinning（發(fā)光）tonight."We have to say,"The stars look pretty.They were shining four years ago but their light has only just reached Earth."

1.If you stand 200 meters away from a man who is firing a gun to start a race,you will find out that _____.

A. you can hear the gun before you see the smoke.

B. the sound of the gun will reach you before the man fires his gun.

C. sound does not travel as fast as light.

D. sound travels about a million times faster than light.

2.Sunlight clearly_____than the light of the moon.

A. moves less quickly B. has to travel a greater distance

C. travels much more quickly D. is less powerful

3.What does " it" in the second paragraph refer to?

A. moon light B. light rays

C. the moon D. the nearest star

4.The scientific way of saying " The stars are shining 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 starlight seen today could be seen four years ago.

D. the stars were shining long ago but are seen tonight.

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

A. away from the star B. on the moon

C. away from the sun D. on the earth

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1.

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Background

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5.

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◇Half of the parents are not 6.of their children's motor skills.

◇40% or more of the parents fail to help their children prepare well　before sports activities, such as warming up and

7. the playground.

Solutions

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◇A special team has been 10.and is now traveling around to popularize child sports safety knowledge and offering free training for young parents.

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