单项选择题

He ______ between life and death for a few days but then he pulled through.

A．hovered
B．lurched
C．wavered
D．fluctuated
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单项选择题
One of the stands ______ and dozens of people were either killed or injured.
A．destroyed
B．collapsed
C．corroded
D．rained
单项选择题
The man who never tries anything new is a(n) ______ on the wheels of progress.
A．obstacle
B．brake
C．break
D．block
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