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．unlike regular programs their intensity of sound varies over a wide range
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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
Commercials create the sensation of loudness because______.
A．TV stations always operate at the highest sound levels
B．their sound levels are kept around peak levels
C．their sound levels are kept in the middle frequency ranges
D．unlike regular programs their intensity of sound varies over a wide range
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