②Other tricks of the trade are also used. Because low-frequency sounds can mask higher frequency sounds, advertisers flter out any noises that may drown out the primary message. In addition, the human voice has more auditory impact in the middle frequency ranges. Advertisers electronically vary voice sounds so that they stay within such a frequency band. ③Another approach is to write the script so that lots of consonants are used, because people are more aware of consonants than vowel sounds. ④Finally, advertisers try to begin commercials with sounds that are highly different from those of the programming within which the commercial is buried. Because people become adapted to the type of sounds coming from programming, a dramatic change in sound quality draws viewer an attention. For example, notice how many commercials begin with a cheerful song of some type.
The attention-getting property of commercials can be seen by observing one-to two-year-old children who happen to be playing around a television set. They may totally ignore the programming. However, when a commercial comes on, their attention is immediately drawn to it because of its dramatic sound quality.
31.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.
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