【題目】__________ 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為什么；句意：為什么好聞的氣味不會減輕人的痛苦，這是科學(xué)家們的難題。故選D。

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