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  3. This passage chiefly discusses______. It took______ for the world to increases its population from 1 billion to 4 billion.

This passage chiefly discusses______. It took______ for the world to increases its population from 1 billion to 4 billion.

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问题 This passage chiefly discusses______.
It took______ for the world to increases 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 事实细节题。从第二段可知世界人口从10亿增加到40亿所经历的时间段是1830年到1975年。故答案为B。
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