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【单选题】

Questions 31 to 35 are based on the following passage.

Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, television stations always operate at the highest sound level allowed for reasons of efficiency. According to one NBC executive, no difference exists in the peak sound level of ads and programming. Given this information why do commercials sound so loud?

The sensation of sound involves a variety of factors in addition to its speak level. Advertisers are skilful at creating the impression of loudness through their expert use of such factors. One major contributor to the perceived loudness of commercials is that mush less variation in sound level occurs during a commercial. In regular programming the intensity of sound varies over a large range. However, sound levels in commercials tend to stay at or near peak levels.

Other “tricks of the trade” are also used. Because low-frequency sounds can mask higher frequency sounds, advertisers filter out any noises that may drown out the primary message. In addition, the human voice has more auditory (听觉的) impact in the middle frequency ranges. Advertisers electronically vary voice sounds so that they stay within such a frequency band. Another approach is to write the script. so that lots of consonants (辅音) are used, because people are more aware of consonants than vowel (元音) sounds. Finally, 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 a 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.

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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题目标签:听觉
参考答案:
参考解析:
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举一反三

【单选题】人的听觉产生于()

A.
听觉感受器
B.
耳蜗
C.
鼓膜
D.
大脑听觉中枢

【单选题】胎儿的听觉传导途径是()

A.
以空气为介质,通过外耳道-膜-听骨链-迷路外淋巴-内淋巴-Corti氏器,在此产生音感受(也称正常气导途径)
B.
头颅骨-鼓室听骨链-内耳(又称骨导途径)
C.
直接经圆窗内淋巴-基底膜-Corti氏器
D.
经过腹壁的肌肉而进人羊水,再经此介质传经头颅骨-鼓室-前庭窗-迷路外淋巴-内淋巴-基底膜-Corti氏器产生声音的感觉
E.
以空气为介质,通过外耳道-膜-听骨链-迷路外淋巴-内淋巴-超声听觉感受器,在此产生声音感受

【单选题】听觉语音加强见于 ( )

A.
肺实变
B.
胸膜增厚
C.
肺气肿
D.
阻塞性肺不张
E.
以上都是

【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...

A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range