It took ______ for the world to increase
2023-10-18 72次 考研 反馈错误 加入收藏 正确率 : 100%
题目内容：
[单选题]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
本题链接：
