【題目】_____ to nuclear radiation, even for a short time, may produce variants (變異體) of genes in human bodies.

A. Exposed B. Being exposed

C. Having exposed D. After being exposed

【答案】B

【解析】

試題分析:考察動詞非謂語形式。暴露在核輻射下，即使是很短的時間，都有可能造成基因的變異。該句中動名詞短語作主語，又根據(jù)句意可知是被動，故選B。

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