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
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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
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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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