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.

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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

单项选择题

______, the world may have population of 12 billion in a century.

A．If man can live longer in the future
B．If the science of medicine is developing fast enough
C．If the population growth is not reduced
D．If the earth is able to provide a good life for more people