单项选择题

Because he is ______ , we cannot predict what course he will follow at any moment.

A．incoherent
B．quiet
C．capricious
D．harmful
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单项选择题
The flashing red light served as a ______ of danger ahead.
A．predictor
B．caution
C．precaution
D．prevention
单项选择题
Weather exports use the ______ of the barometer as one of their guides in predicting the weather.
A．isobars
B．fluctuations
C．gradations
D．mercury
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