【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：考查動名詞作主語。being exposed to nuclear radiation為動名詞短語作主語。本句意為：暴露在核輻射下，甚至是一小會，都會導(dǎo)致人體內(nèi)基因的變異。故選B。

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