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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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