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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单项选择题
One of the reasons why commercials are able to at, act 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
According to the passage, the maximum intensity of sound coming from commercials ______.
A．does not exceed that of programs
B．is greater than that of programs
C．varies over a large range than that of programs,
D．is less that that of programs
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