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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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．ruined
单项选择题
One new ______ to learning a foreign language is to study the language in its cultural context.
A．approach
B．solution
C．manner
D．road
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