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【题目】Doctors are doing research to find out what happens physically when people______ smoking.

A.quit B.decline C.prevent D.reserve

【答案】A

【解析】

试题分析:考查动词辨析。动词quit放弃,戒除;decline下降;prevent阻止,预防;reserve预定,保留;句意:医生们正在研究当人们戒烟的时候身体上会发生什么变化。根据句意可知A正确。

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