单项选择题

Feeling threatened, companies responded by writing ever-longer warning __________, trying to anticipate every possible accident.

A．symbols
B．labels
C．signals
D．marks
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单项选择题
I caught __________ of the river as the train passed over a bridge.
A．vision
B．scene
C．sight
D．glimpse
单项选择题
To escape the police the suspect had to conceal his __________ under a false name.
A．identity
B．evidence
C．status
D．recognition
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