问题
单项选择题
It is postulated that population trends have an effect on economic fluctuations.
A．challenged
B．assumed
C．deducted
D．decreed
答案
参考答案：B
解析：[分析] 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。