Western nations have older and shrinking populations since they entered the 21st century and their（）birth rates have also posed problems._精华吧

Western nations have older and shrinking populations since they entered the 21st century and their（）birth rates have also posed problems.

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Western nations have older and shrinking populations since they entered the 21st century and their（）birth rates have also posed problems.

A.floating

B.fluctuating

C.flowing

D.drifting

正确答案：fluctuating

Tag：大学英语时间：2024-01-04 10:49:04

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