单选题：Public policy and education efforts may help to do away with

题目内容：

Public policy and education efforts may help to do away with A．death rate
B．various cancer
C．unfair social difference
D．biological difference

参考答案：

答案解析：

Forty May Be the New 30 As Scientists Redefine Age　　Is 40 re

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Mother Nature Shows Her Strength　　Tornadoes (龙卷风). and heavy thunderstorms moved

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