单项选择题

At first _________ it looked like a simple accident, but later the police became suspicious.

A．sight
B．view
C．attempt
D．glimpse
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单项选择题
The candles were useless in the _________ smoke, and it was many minutes before the rescuers could see.
A．intense
B．severe
C．vigorous
D．dense
单项选择题
Its mere arrival on the scene will not _________ a revolution in education or in politics.
A．secure
B．assure
C．convince
D．ensure
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