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30years,两者相加130years,即选项C。
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