题目内容

【题目】─Do you know_____second-hand smoke? ─To protect 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

试题句意：--你知道我们为什么要阻止二手烟吗？--为了保护我们的健康和记忆。考查宾语从句的用法，从句要用陈述语序，因此第一项、第三项符合，通过答语体现对原因进行提问，因此第三项正确。故选C

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