【題目】Doctors are doingto find out what will happen when people stop smoking,
A.exercise
B.housework
C.research
D.training

【答案】C
【解析】句意：醫(yī)生們正在做研究，以找出當(dāng)人們停止吸煙會發(fā)生什么。此處缺少名詞，根據(jù)語境可知。A.練習(xí)，鍛煉；B.家務(wù)勞動；C.研究；D.訓(xùn)練。故選C。

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