阅读理解。
There is nothing more important than the sun. Without the sun all living things(生物) on the earth will die.
The sun is a star. In the sky there are thousands of stars like the sun. They are as large as the sun and as
hot as the sun. At night you can see many stars, but in the daytime you can see only one star, the sun.
The sun is much nearer to us than any other star. That is why it looks the biggest and the brightest of all
the stars. The distance of the sun from the earth is as much as 150 million kilometers. Most of the stars are
thousands of light years away from the earth.
Do you know the light year? Nothing in the world travels faster than the light. It travels 300,000 kilometres
a second (one-sixtieth of a minute). And one light year is the distance that light travels in one year.
1. Without the sun, ___.
A. some living things will live on the earth
B. people can not live on the earth
C. only some plants can live on the earth
D. there will be no stars in the sky
2. In the daytime you can only see the sun because _____.
A. other stars are too far away
B. there are no other stars in the sky
C. the sun is the biggest in the sky
D. the other stars only come out at night
3. Why does the sun look the biggest and the brightest of all the stars?
A. The sun is far away from the earth.
B. The sun is the nearest star to the earth.
C. The sun is 150 kilometres away from the earth.
D. The sun is much bigger and brighter than other stars.
4. Light travels _____.
A. 300,000,000 kilometres a minute
B. 300,000 metres a second
C. 300,000,000 metres a second
D. 3000,000 kilometres a minute
5. "Light year" in this passage means _____.
A. light
B. year
C. a far-away place
D. a very, very long way

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