Question

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

Answer 1

【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。