According to the passage, the maximum intensity of sound coming from commercials______. Many commercials begin with a cheerful

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问题 According to the passage, the maximum intensity of sound coming from commercials______.
Many commercials begin with a cheerful song of some kind because______.

选项 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

答案C

解析
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