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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1．人们在节假日无节制消费 2．大量消费对个人和社会的影响 3．我的看法……
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
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