单项选择题
The flashing red light served as a ______ of danger ahead.
A．predictor
B．caution
C．precaution
D．prevention
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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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单项选择题
In the British theater young people under thirty-five have not had much ______ getting recognition onstage, but offstage--in the ranks of playwrights, directors, designers, administrators--they have mostly been relegated to relative obscurity.
A．trouble
B．satisfaction
C．curiosity about
D．fear of
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