2. 外语
  3. A population explosion will lead to ______. It took ______ years for world population to grow from 1 billion to 3 billion.

A population explosion will lead to ______. It took ______ years for world population to grow from 1 billion to 3 billion.

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问题 A population explosion will lead to ______.
It took ______ years for world population to grow from 1 billion to 3 billion.
选项 A、100
B、115
C、130
D、145
答案C
解析 本题为计算题，信息点定位在第五段，由1 billion到2 billion需100 years，由2 billion到3 billion需30 years，两者相加130 years，即选项C。
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