When Laurie Aronson was over 35, she did not feel worried because she was unwilling to get married. Nowadays, demographic forec

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问题 When Laurie Aronson was over 35, she did not feel worried because she was unwilling to get married.
Nowadays, demographic forecasting is becoming extremely difficult partly because of ______.

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答案some unexpected shifts

解析 定位到末段首句Such unexpected shifts are part of what makes demographic forecasting extremely difficult... the midst of a hurricane.[精析] 同义转述题[考频:22]。此处要填入名词性成分作because of的宾语。从原文可知,就是这样未曾预料到的转变使得现在的人口统计预测变得非常困难。题干将原文的句型进行了改写,但不难得出答案为some unexpected shifts。
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