单项选择题

It isn't an easy job to carry out a general plan for birth control throughout the world because ______.

A．there are too many undeveloped countries in the world
B．undeveloped countries in the world
C．different governments have different views of the questions
D．even developed countries may have complex problems
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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
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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