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【题目】Doctors are doing research to find out what happens physically when people ________ smoking. ( )
A.quit
B.refuse
C.ignore
D.prevent

【答案】A
【解析】A.quit放弃,停止;B.refuse拒绝;C.ignore忽视,不理睬;D.prevent阻止,预防;句意:医生们正在做研究,目的是弄清楚当人们停止吸烟时身体会发生什么变化。根据句意,故选A。

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