It is postulated that population trends have an effect on economic fluctuations.

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问题 It is postulated that population trends have an effect on economic fluctuations.

选项 A、challenged
B、assumed
C、deducted
D、decreed

答案 B

解析动词辨析postulate要求，假定；A．challenge向……挑战；B．assume假定，假设；C．deducte扣除，演绎；D．decree颁布；本句意为：人们假定人口趋势对经济波动会有影响。因此B为答案.

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