詞匯選項
    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
    【正確答案】 A
    【答案解析】 該題說的是：抽煙會縮短人們的預期壽命。原文最后一句說了：煙草與人的預期的壽命縮短有關(guān)。