单项选择题

Which decade sees the sharpest increase in population between 65-74（）

A．2010s
B．1990s
C．2000s
D．1980s

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单项选择题
A: You seem to be having some problems.B:_______I’ll manage.
A．I’m afraid not.
B．Are you sure
C．Is it so
D．It’s all right.
填空题
A．emerged B．rooted C．originated D．appeared
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