---Do you know second-hand smoke?---To protec...

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---Do you know 　　　　　　　　　　　　　　　 second-hand smoke?

---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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少年，再来一题如何？

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