Which of the following is net true according to the passage? How many significant demographic changes ever occurred in the past

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问题 Which of the following is net true according to the passage?
How many significant demographic changes ever occurred in the past one million years?

选项 A、One.
B、Two.
C、Three.
D、None.

答案C

解析本题考查对相关细节的掌握。从文章第一段我们知道在过去一百万年中人口经历了三次重大变化，所以这一题答案很容易找到。

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大学英语四级

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