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【题目】__________ pleasant smells do not reduce pain in men is a puzzle for scientists.

A. Whether B. What

C. That D. Why

【答案】D

【解析】A. Whether是否;B.What什么;C.That那;D.Why为什么;句意:为什么好闻的气味不会减轻人的痛苦,这是科学家们的难题。故选D。

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