What does the passage mainly discuss? The growth of the population caused the change of its ______ Massive waves of immigration

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问题 What does the passage mainly discuss?
The growth of the population caused the change of its ______ Massive waves of immigration brought new ethnic groups into the country. Geographic and social mobility— downward as well as upward—touched almost everyone.

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答案makeup

解析 参见文章第三段前三句话。人口的增加导致其结构的变化。大量少数民族移人,社会阶层间的流动影响到了每个人。
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