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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(dòng)詞。句意:靠近核輻射,甚至在很短的時(shí)間,可能在人體內(nèi)產(chǎn)生基因變異。分析句子結(jié)構(gòu),空格處是作主語,故要用動(dòng)名詞形式,故選A。

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