单项选择题

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

A．by accident
B．on average
C．on occasion
D．at random
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You must ______ yourself, or they will continue to bully you, so you will go on living in disgrace.
A．promote
B．strengthen
C．assert
D．assess
单项选择题
They are taught by their superiors that a soldier who ______ his post in time of war is to be shot.
A．deserts
B．deflects
C．detains
D．threw
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