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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1464

─Do you know          second-hand smoke?
─To prevent our health and memory.

A.how we should prevent
B.where should we prevent
C.why we should prevent
D.whether we should prevent
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─Doyouknowsecondhandsmoke?─Top