单项选择题

The book gives a brief （）of the course of his research up till now.

A. outline
B. reference
C. frame
D. outlook

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单项选择题
We realized that he was under great（）,so we took no notice of his bad temper.

A. excitement
B. stress
C. crisis
D. nervousness
单项选择题
This is not the right ______ to ask for my help; I am far too busy even to listen!
A. moment
B. situation
C. opportunity
D. circumstance
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