单项选择题

A．In the 15th century.
B．In the 16th century.
C．In the 5th century.
D．In the 6th century.
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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
It is no easy job to carry out a general plan for birth control throughout the world because ______.
A．there are too many underdeveloped countries in the world
B．underdeveloped countries have low level of industrial development
C．different governments have different views of the question
D．even developed countries have complex problems
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