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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单项选择题
This teaching method is a ______ of many methods which have been used for decades in the country.
A．symposium
B．symphony
C．spectrogram
D．synthesis
单项选择题
The Coriolis force causes all moving projectiles on Earth to be ______ from a straight line.
A．distracted
B．deviated
C．intrigued
D．permeated
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