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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