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：

在黏土中连续沉桩时，由于土中水的作用，会使桩周摩阻力（　　）。

在黏土中连续沉桩时，由于土中水的作用，会使桩周摩阻力（　　）。 A．不变 B．略有增大 C．略有减小 D．大为减少

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Which may NOT be a reason for higher cancer death rates among US blacks?A．Unequa

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According to the passage, the abilities a child has inherited from his parents（

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By encouraging its employees to exercise General Motors could saveA．$790，000 per

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