单项选择题

The speaker went on and on, ______ to his listeners' obvious boredom.

A．obligated
B．obsessive
C．obvious
D．oblivious
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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
An institution concerned about its reputation is at the mercy of the actions of its members, because the misdeeds of individuals are often used to ______ the institutions of which they are a part.
A．coerce
B．honor
C．discredit
D．intimidate
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