单选题
1.【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.True
B.False
C.Not Given
正确答案：A
答案解析：该题说的是：抽烟会缩短人们的预期寿命。原文最后一句说了：烟草与人的预期的寿命缩短有关。