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The teacher told me that the earth ________ around the sun.
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①Galileo collected the facts ________ proved the earth and all the other planets move around the sun．
②Galileo discovered the fact ________ the earth and all the other planets move around the sun．
A．that
B．which
C．不填
D．A and B
Fill in the blanks with the proper verb forms.
The geography teacher told us the earth ______ (move) around the sun.
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The geography teacher told us the earth ______ (move) around the sun.
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阅读理解：
Our sun is a star, and nine worlds move around it. Worlds like these are called planets.
But there are other stars, other suns. Not only thousands of them, but millions of millions. Do different stars have planets? We can see planets round our own sun. But we haven't seen any more. The stars are too far away from us. Stars give out light, but the planets don't have any light of their own. So we can't see them. They are too far and too dark.
Still, we can tell that some stars have planets. While a big planet goes round, it pulls its stars to one side. And sometimes we can see this. Then we know that the star has a planet.
For example, Barnard's Star is a small red star. And it is the quickest star in the sky. But sometimes it moves slower, and then quicker again. We have examined this star for a number of years, and now we are certain it has a planet.
1．Worlds moving around the sun are called ________.
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2．From the article we know that ________.
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A．there is only one sun in the universe
B．there are millions of millions of stars in the universe
C．every star can be seen with our eyes
D．all the stars are not very far from us
3．Though we can't see all of them still we can tell that ________.
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A．some stars have planets
B．some planets have light of their own
C．some stars give out no light
D．a big planet is moving towards its star
4．The article tells us that ________.
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A．Barnard's Star is the farthest from the earth
B．Barnard's Star gives out the strongest light
C．Barnard's Star is a small red one
D．Barnard's Star has no planet at all
5．Which of the following is true?
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A．We have examined Barnard's Star since some months ago.
B．We have no way to tell whether a star has a planet or not.
C．A planet always pushes its star away from it.
D．Barnard's Star does not always move at the same speed.
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