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阅读判断

Since 1939， numerous studies have been conducted to determine whether smoking is a health hazard. The trend of the evidence has been consistent and indicates that there is a serious health risk. Research teams have conducted studies that show beyond all reasonable doubt that tobacco smoking is associated with a shortened life expectancy.

　　Q： Smoking reduces one's life expectancy.

　　A.Right

　　B.Wrong

　　C.Not mentioned

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