【題目】—Do you know ______ second-hand smoke?

—To protect our health.

A. how we should preventB. where should we prevent

C. why we should preventD. where we should prevent

【答案】C

【解析】

句意：——你知道為什么我們應(yīng)該防止二手煙嗎?——為了保護(hù)我們的健康�？疾橘e語從句。賓語從句需用陳述句語序，選項(xiàng)B是疑問句語序，可排除。how問方式，why問原因，where問地點(diǎn)；根據(jù)回答To protect our health.，可知問的是原因，故選C。

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