单项选择题

A power failure created ______ in transportation.

A．emergency
B．enclosure
C．extension
D．excitement
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单项选择题
The nurse was dismissed because she was found to be ______.
A．roundabout
B．corresponding
C．vigilant
D．negligent
单项选择题
I saw them bending with great ______ over the machines.
A．concentration
B．endeavor
C．tolerance
D．absorption
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