单项选择题

Silver is the best conductor of electricity, copper ______ it closely.

A．followed
B．following
C．to follow
D．being followed
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单项选择题
A thief broke ______ when I was leaving for my office.
A．in
B．up
C．out
D．off
单项选择题
It is so heavy that it can only be lifted with our ______ effort.
A．joint
B．equal
C．able
D．capable
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