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
The two witnesses who saw the shootings were able to ______ who hard fired first.
A．encounter
B．highlight
C．testify
D．identify
单项选择题
To qualify for such a position, the native would first have to receive specialized training, and this is ______.
A．refused
B．discouraged
C．denied
D．forbidden
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