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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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
单项选择题
She never ______ to read the news but turned at once to the crossword on the last page.
A．indulged
B．troubled
C．exerted
D．frustrated
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