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
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单项选择题
Which of tile following statements is TRUE
A．The total growth rate of world population will increase.
B．The growth rate of population in richer countries will increase.
C．The growth rate of population in poorer countries will increase.
D．The total growth rate in American countries will increase.
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.
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