单项选择题

We should throw away these old ______.

A．teeth brush
B．teeth brushes
C．tooth brush
D．tooth brushes
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单项选择题
The ______ of those tribes decided to fight for their lands.
A．chiefs
B．thieves
C．chief
D．chies
单项选择题
Are your shoes new
A．No, it's old.
B．No, they are old.
C．Yes, it's old.
D．Yes, they are ol
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