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【題目】_________to nuclear radiation, even for a short time, may produce variants of genes in human bodies.

A. Being close B. Having been closed

C. Closed D. After being closed

【答案】A

【解析】考查非謂語動詞。句意：靠近核輻射，甚至在很短的時間，可能在人體內產生基因變異。分析句子結構，空格處是作主語，故要用動名詞形式，故選A。

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