单项选择题

Grocery store price lists are updated by______.

A．a scanner
B．a telephone hookup
C．an adding machine
D．an employee
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单项选择题
We are told that a high-tech cash register is really just______.
A．an electric instrument of sight.
B．a simple adding machine.
C．a way to keep employees honest.
D．an expensive piece of window dressin
单项选择题
One of the reasons why commercials are able to attract viewer attention is that______.
A．the human voices in commercials have more auditory impact
B．people like cheerful songs that change dramatically in sound quality
C．high-frequency sounds are used to mask sounds that drown out the primary message
D．they possess sound qualities that make the viewer feel that something unusual is happening
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