单项选择题

The police inspector, having received new information from a confidential source, decided to enlarge the ______ of his enquiry.

A．scope
B．magnitude
C．dimension
D．volume
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单项选择题
The speaker went on and on, ______ to his listeners' obvious boredom.
A．obligated
B．obsessive
C．obvious
D．oblivious
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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