Which is smaller, the sun _____________the moon?

Which is smaller, the sun ________ the moon?

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The moon is a ball, too, like the sun and the earth. Sometimes it looks as round as a plate, sometimes it looks like half a plate, or like a thin slice(片) of yellow melon(瓜).But whether you can see all of it or not, the moon is always round. Part of it is dark because it is always turned away from the sun. The moon has no light of its own. Moon light is only sunlight shining on the moon.

The moon is much smaller than the sun, even smaller than the stars. As the moon is nearer to us, it looks bigger. All day the stars are in the sky, but the light from the sun is so bright that you can not see them. Stars look as tiny(极小) as pinheads(针头), but some are even bigger than the sun. The sun looks big because it is closer than the other stars. The farther away a thing is, the smaller it looks, even if(即使) it is really very big.

1.No fire on earth 　　　　 .

A. can burn a thing

B. can be seen anywhere

C. is as red as the sun

D. is bigger and hotter than the sun’s flames

2. As everyone knows 　　　　 .

A. the moon turns around the sun just as the earth goes

B. the earth moves around the sun but the moon doesn’t

C. the sun moves around the earth just as the moon does

D. the sun is always turned away from the moon

3. Why has the moon no light of its own? Because 　　　　 .

A. part of it is always turned away from the sun

B. the sunlight is shining on the moon all day

C. it is always round, like a yellow gold(金) plate

D. the article(短文) doesn’t tell us the reason

4. Why can’t we see the stars all day? Because 　　　　 .

A. they are too small to see　　　　　　　　　　　　　　   

B. they are nearer to us

C. the sun light is too bright　　　　　　　　　　　　　　  

D. they look as tiny as pinheads

5.Which of the following is the topic(主题) sentence of the last paragraph(自然段)?

A. The farther away a thing is, the smaller it looks, even if it is very big.

B. The moon is much smaller than the sun, even smaller than the stars.

C. The sun looks big because it is closer than the other stars.

D. Stars look as tiny as pinheads, but some are even bigger than the sun.