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　　From boyhood he had been interested in astronomy(天文學), and while at Cambridge he would sit up at night to watch the stars. But he was not satisfied with the telescopes of those days because they didn't show him a clear picture of things. At first he thought there must be something wrong with the lens. But no matter how hard he tried to improve the lens; the trouble was still there.

　　This set Newton thinking. He began to study the nature of light and colors. In the end he found that sunlight, or white light, is actually made up of a row of colors. He counted seven colors in all. This was of course a great discovery. But Newton still wasn't satisfied His mind was busy with another problem. Before Newton's time, scientists had already discovered that the sun, not the earth, was the centre of the other planets moving round the sun. But they couldn't explain why this was so until Newton gave the answer.

　　One autumn evening while Newton was sitting under an apple tree thinking over these problems, he saw the moon rise in the sky. Why, he asked himself, should the moon go round the earth, never leaving the same path? At that moment, he heard an apple drop from the tree. Why didn't it go sideways or fly up?

　　There seemed to be only one reason：the earth was drawing it－that is the force of gravity. If a stone is tied to the end of a string and whirled around, it will fly round and round in circles because of the string. In the same way, the force of gravity, thought Newton, must be the force that keeps the moon going round the earth and the planets round the sun.

1．This passage mainly tells us ________.

[　　]

A．Newton gave the right answer to the making up of the sunlight

B．Newton found that the moon goes round the earth

C．how Newton made two of his greatest discoveries

D．why Newton made two of his greatest discoveries at home

2．Which of the following is NOT true according to the passage?

[　　]

A．Newton made only two discoveries in his lifetime.

B．Finding nothing wrong with the lens, Newton began to study the nature of light and colors.

C．Nobody could explain why the planets moved round the sun before Newton's time.

D．It was by chance that Newton discovered the force of gravity.

3．Give the right order of the events given in the passage.

a．Newton found that the sunlight is made up of a row of colors.

b．Newton wondered why the apples didn't go sideways.

c．Newton concluded that the force of gravity keeps the moon going round the earth.

d．Newton tried every means to improve the lens.

e．Newton counted the number of colors.

[　　]

A．e, d, c, a, b

B．e, a, c, b, d

C．d, a, e, b, c

D．d, e, a, b, c

4．Which of the following is nearest in meaning to “They couldn't explain why this was so until Newton gave the answer.”?

[　　]

A．Newton gave the answer because they couldn't explain why.

B．Newton couldn't explain why unless they gave the answer.

C．It was Newton who gave the answer.

D．Newton was the first to give the answer.

答案：C;A;C;D
解析：

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