---Do you know second-hand smoke? ---To ...

---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

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。考点：考查宾语从句。

考点分析：

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