【题目】__________ pleasant smells do not reduce pain in men is a puzzle for scientists.
A. Whether B. What
C. That D. Why
在线课程【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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