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Newton was sitting under an apple tree ______ an apple fell onto his head.

A.when

B.while

C.after

D.before

 

【答案】

A

【解析】本題考查連詞辨析。此處when作并列連詞,表示“就在此刻(and justthen)”“,突然(and suddenly)”。

 

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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?

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1.This passage mainly tells us ________.

[  ]

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

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[  ]

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[  ]

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