单项选择题

He had a clear ______ of what was wrong with the machine and fixed it in a short time.

A．debris
B．deficiency
C．perception
D．persecution
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单项选择题
What does the passage tell us about rainfall in the desert
A．It never rains.
B．It rains so little that nothing can live.
C．It rains unexpectedly.
D．It rains very infrequently.
单项选择题
What does the word mind-stretching imply
A．Obtaining one’s mental power.
B．Strengthening one’s power of thought.
C．Making great demands on one’s mental power.
D．Exerting one’s mental power as far as possible.
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