单项选择题

To food a large population, ______.

A．inferior land must be cultivated
B．good land must work intensively
C．each person must produce less
D．Both A and B.
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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 and a lower average income
D．higher productivity and a higher average income
单项选择题
The government of the developed countries may prefer to ______.
A．a stable population
B．a slowly-increasing population
C．a fast-increasing population
D．a declining population
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