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How many significant demographic changes ever occurred in the past one million years?A.One. B.Two. C.Three. D.None.

A.One.
B.Two.
C.Three.
D.None.

【参考答案】

C
C
[注释] 从第一段第三句可知：在过去一百万年中人口经历了三次重大变化。
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