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
Because Bob had stopped reading his technical journals he was ______ of new development in his field.
A．intellectual
B．subtle
C．ignorant
D．tedious
单项选择题
The plane ______, its bombs exploding as it hit the ground.
A．smashed
B．clashed
C．struck
D．crashed
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