单项选择题

I don't think it's wise of you to ______ your greater knowledge in front of the director, for it may offend him.

A．show up
B．show out
C．show in
D．show off
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单项选择题
The returns in the short ______ may be small, but over a number of years the investment will be well repaid.
A．interval
B．range
C．span
D．term
单项选择题
There were many people present and he appeared only for a few seconds, so I only caught a ______ of him.
A．glance
B．glimpse
C．look
D．sight
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