单项选择题

Bicycles make the air ______.

A．clean
B．dirty
C．noisy
D．fresh
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单项选择题
Teenagers shouldn't be ______ from school although they don't do well in studies.
A．disappeared
B．gone
C．removed
D．beaten
单项选择题
Is this museum ______ you visited a few days ago
A．where
B．that
C．on which
D．the one
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