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The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.

A.limit B.lack C.need D.demand 

B

解析试题分析:A限制;B缺少;C需要;D要求;句意:专家说现在又很多和不好的饮食和缺乏锻炼有关的问题。本句中的a lack of缺少…是一个固定搭配。根据句意说明B正确。
考点:考察名词词义辨析

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