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

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热门试题

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

单项选择题

Eye-movements during sleep are in ______ state.

A．the same
B．a splendid
C．a different
D．a weak