单项选择题

The birth rate all over the world will remain the same in the 21st century.

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
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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