_____to nuclear radiation, even for a short time , may produce variants(變異體) of genes in human bodies.

A. Being exposed B. Having expose

C. Exposed D. After being exposed

 

A

【解析】

試題分析：考查非謂語(yǔ)動(dòng)詞。句意：暴露在核輻射下，甚至很短的時(shí)間就可能在人的身體里產(chǎn)生基因變異。Being exposed to nuclear radiation 是這個(gè)句子的主語(yǔ)，中間的插入語(yǔ)even for a short time 可以不用管。may produce是謂語(yǔ)， variants of genes in human bodies是賓語(yǔ)。選項(xiàng)B、C、D在句首時(shí)都是作狀語(yǔ)的，不能做主語(yǔ)，所以不對(duì)。故選A。

考點(diǎn)：考查非謂語(yǔ)動(dòng)詞

 

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