单项选择题

A．They are twins.
B．They are classmates.
C．They are friends.
D．They are colleagues.
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单项选择题
The main difference between cordless phones and cellphones is that cordless phones can only operate in a limited range.
A．Y
B．N
C．NG
单项选择题
A．In central London.B．Near a police station.C．By the tube station.D．On a side street.
A．In central London.
B．Near a police station.
C．By the tube station.
D．On a side street.
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