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

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：

During the Second World War, all important resources in the

During the Second World War, all important resources in the U.S. were allocated

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