A-A+
It took ______ for the world to increase its p
问题详情
It took ______ for the world to increase its population from 1 billion to 4 billion.
A) 100 years
B) 145 years
C) 1975 years
D) Over two million years
参考答案
正确答案:B
答案:B
[试题分析] 事实推断题。
[详细解答] 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,B应为正确答案。