-Do you know second - hand smoke?一To protect our health and memory.A how we should prevent B. why should we preventC. why we should prevent D. whether we should prevent 题目和参考答案——青夏教育精英家教网—

题目内容

-Do you know____ second - hand smoke?

一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

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