单项选择题

According to the passage, a large population will produce a chance for developing ______.

A．agriculture
B．transport system
C．industry
D．national economy
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单项选择题
According to the first paragraph, the atmosphere is essential to man in that it ______.
A．protects him against the harmful rays from space
B．provides sufficient light for plant growth
C．supplies the heat necessary for human survival
D．screens off the falling meteors
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
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