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【题目】----Do you know_____ second-hand smoke? ----To prevent our health and memory.

A. how we should prevent B. how we should prevent

C. why we should prevent D. whether we should prevent

【答案】C

【解析】

试题分析:句意:--你知道为什么要防止二手烟呢?—为了我们的健康和记忆。这里是宾语从句,宾语从句的语序应该用陈述语序,故排除B;根据句意故选C。

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