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
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 than that of programs
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 qualifies that make the viewer feel that something unusual is happening
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