单项选择题

A population explosion will lead to ______.

A．a lot of social problems
B．medical advances
C．a decrease in food production
D．a worse life in every nation with 3 billion
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单项选择题
This passage tells us that ______.
A．the United Nations thinks it possible to avoid a population explosion
B．5.1 billion people are living in the underdeveloped countries
C．in advanced nations the population growth is being controlled
D．the world's population is increasing.
单项选择题
It took ______ years for world population to grow from 1 billion to 3 billion.
A．100
B．115
C．130
D．145
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