4. 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.
5. In the passage, the author is trying to tell us ________.
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.
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5 Passage 3
Im usually fairly skeptical about any research that concludes that people are either happier or unhappier or more or less certain of themselves than they were 50 years ago. While any of these statements might be true, they are practically impossible to prove scientifically. Still, I was struck by a report which concluded that todays children are significantly more anxious than children in the 1950s. In fact, the analysis showed, normal children ages 9 to 17 exhibit a higher level of anxiety today than children who were treated for mental illness 50 years ago.
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