单项选择题

When a machine analyses the frequencies used by a particular voice and draws a graph of them, sound is ________electronically into a pattern of lines.

A．relieved
B．converted
C．magnified
D．burst
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单项选择题
Questionnaires were sent to all ________trade unions.
A．afflicted
B．addicted
C．ascertained
D．affiliated
单项选择题
He has done stupid things before, but to look for the escaping gas with a match really was the ________silliness.
A．triumphant
B．unanimous
C．trivial
D．ultimate
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