单项选择题

A．His eyesight was too poor.
B．He has to work to support himself.
C．Physics was too hard for him.
D．He didn’’t like physics any more.
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单项选择题
A．They are twins.B．They are classmates.C．They are friends.D．They are colleagues.
A．They are twins.
B．They are classmates.
C．They are friends.
D．They are colleagues.
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
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