单项选择题

In a developed country, people will perhaps go out of work if the birthrate ______.

A．goes up
B．goes down
C．remains stable
D．is out of control
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单项选择题
A small population may mean ______.
A．higher productivity, but a lower average income
B．lower productivity, but a higher average income
C．lower productivity, but a lower average income
D．higher productivity, and a higher average income
单项选择题
From the passage we know that, slowly raising birthrate perhaps is good for ______.
A．a developing nation
B．a developed nation
C．every nation with a big population
D．every nation with a small population
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