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
—Hello! How are you— ______.
A． Fine, thank you. And you
B． How are you
C． Hello.
单项选择题
—It's a bird.—I don't know ______ name.
A． it
B． his
C． its
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