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

（）, 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

单项选择题

By the year 2000, today's（）nations will have a total population of 5 billion people, nearly four fifth of the world's population.

A．biggest
B．Asian
C．developing
D．developed