【題目】---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】試題分析：句意：你知道我們?yōu)槭裁磻?yīng)該阻止二手煙嗎。——為了保護(hù)我們的健康和記憶。本題考查賓語從句，注意用陳述語序；根據(jù)回答表示的是目的，所以疑問詞應(yīng)該用why，故選C。

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