【題目】It remains a puzzle for scientists ______ pleasant smells do not reduce pain in men.

A. whatB. why

C. howD. whether

【答案】B

【解析】

考查同位語(yǔ)從句的引導(dǎo)詞。句意：為什么令人愉悅的氣味不能減輕男性的痛苦，這仍然是科學(xué)家們的困惑。本句為同位語(yǔ)從句修飾puzzle，且從句中缺少原因狀語(yǔ)，故選B。

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