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
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
单项选择题
Many commercials begin with a cheerful song of some kind because______
A．pop songs attract viewer attention
B．it can increase their loudness
C．advertisers want to make them sound different from regular programs
D．advertisers want to merge music with commercials
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