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

考點：考查非謂語動詞

 

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