单项选择题

Why will the population in poorer countries increase（）

A．Because they need more labor to support the family.
B．Because the people have the habit to have a big family.
C．Because the people there are poorer.
D．Because the people there want to be rich.

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单项选择题

What is the reason for the going down of the population in rich countries（）

A．The people there have a secure future.
B．The people there have a glorious past.
C．The government carries out a family plan.
D．The government controls the growth rate.

单项选择题

According to the passage, the growth rate of the world population is going down,（）.

A．so the population problems will get worse
B．but the population problems are still getting worse
C．therefore, the population problems should become worse
D．thus, the population problems will become worse