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【题目】— Do you know________second—hand smoke? — To protect our health.

A.how we should preventB.where should we preventC.why we should prevent

【答案】C

【解析】

句意:——你知道我们为什么要阻止二手烟吗?——保护我们的健康。

考查宾语从句的用法,从句要用陈述语序。因此排除B。通过答语可知体现对原因进行提问,因此C项正确。故选C

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