This passage chiefly discusses ______. It took ______ for the world to increase its population from 1 billion to 4 billion.

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问题 This passage chiefly discusses ______.
It took ______ for the world to increase its population from 1 billion to 4 billion.

选项 A、100 years
B、145 years
C、1975 years
D、Over two million years

答案B

解析 事实推断题。在第二段中,作者介绍,世界人口于1830年达到十亿,而到1975年达到40亿。因此,世界人口从十亿增加到40亿花了145年。
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