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

A．when

B．while

C．a(chǎn)fter

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(xué)), 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.

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