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【题目】---Do you know second-hand smoke?

---To protect our health and memory.

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

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

【答案】C

【解析】

试题分析:句意:你知道我们为什么应该阻止二手烟吗。——为了保护我们的健康和记忆。本题考查宾语从句,注意用陈述语序;根据回答表示的是目的,所以疑问词应该用why,故选C。

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