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
Small population may mean ______.
A．higher productlvity, but a lower average income
B．lower productivity, but a higher average income
C．lower productivity and a lower average income
D．higher productivity and a higher average income
单项选择题
According to the passage, a large population will provide a chance for developing ______.
A．agriculture
B．national economy
C．industry
D．transport system
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