单项选择题

Radio reception wasn't very good because of a disturbance in the atmosphere; the announcer's voice sounded very _________.

A．disputed
B．disclosed
C．distorted
D．discarded
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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．contrived
B．converted
C．magnified
D．manifested
单项选择题
The business-to-business Internet revolution excludes_________.
A．cutting down cost of sales
B．speeding distribution of commodities
C．increasing productivity of the companies
D．changing the structure of the companies
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