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
Stop asking all these personal questions! It is bad manners to be ______.
A．inquisitive
B．impatient
C．acquisitive
D．informative
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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