According to the passage, the maximum intensity of sound coming from commercials______. In the passage, the author is trying to

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问题 According to the passage, the maximum intensity of sound coming from commercials______.
In the passage, the author is trying to tell us ______.

选项 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

答案D

解析
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