单选题：It is postulated that population trends have an effect on ec

题目内容：

It is postulated that population trends have an effect on economic fluctuations. A．challenged
B．assumed
C．deducted
D．decreed

参考答案：

答案解析：

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Philip Roth was hailed as a major new author in 1960.A．published B．challenged C．

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分类：理工类题型：单选题