单项选择题

In the past twenty years the replacement rate has been falling in every country.

A． Right
B． Wrong
C． Doesn't say
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单项选择题
More people are living in the U.S.A nowadays.
A． Right
B． Wrong
C． Doesn't say
单项选择题
As to the world population, the public have the same idea as the experts.
A． Right
B． Wrong
C． Doesn't say
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