简答题:Historical evidence shows that birth and death rates level

题目内容:
Historical evidence shows that birth and death rates level off as countries move into the industrial stage.
A.历史资料显示,随着国家进入工业社会阶段,人口出生率和死亡率会持平。
B.历史材料表明,人口出生率和死亡率会下降,因为一些国家进入了工业阶段。
C.历史材料表明,随着一些国家进入工业高度发展阶段,这些国家的人口出生率和死亡率将会持平。
D.历史经验告诉我们,人口出生和死亡的比率下降是因为每个国家把重点都放在工业上。
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