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
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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
单项选择题
In the passage, the author is trying to tell us______.
A．how TV ads vary vocal sounds to attract attention
B．how the loudness of TV ads is overcome
C．how advertisers control the sound properties of TV ads
D．how the attention-getting properties of sounds are made use of in TV ads
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