单项选择题

The magician picked several persons ______ from the audience and asked them to help him with the performance.

A．by accident
B．on occasion
C．at random
D．on an average
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Was he trying to put me off the ______ because I had come too close to the truth
A．scent
B．fragrance
C．essence
D．stuff
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Five children ______ before firefighters could put out the blaze.
A．pondered
B．perished
C．petitioned
D．permeated
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