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    【题目】—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：——你知道为什么我们应该防止二手烟吗?——为了保护我们的健康。考查宾语从句。宾语从句需用陈述句语序，选项B是疑问句语序，可排除。how问方式，why问原因，where问地点；根据回答To protect our health.，可知问的是原因，故选C。

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