【題目】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放棄，停止；B．refuse拒絕；C．ignore忽視，不理睬；D．prevent阻止，預(yù)防；句意：醫(yī)生們正在做研究，目的是弄清楚當(dāng)人們停止吸煙時(shí)身體會(huì)發(fā)生什么變化。根據(jù)句意，故選A。

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