Consonants vary depending on where and how the air stream gets through, the place and

tisements. 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 peak 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 much 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 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

A.Do you think going online does good to kids？

B.______.

C.Yes, perfectly

D.Well, it depends

E.Nothing at all

F.F.Yes, I think it is

After contracting frontotemporal dementia, the 68-year-old lawyer

[ A] became more dependent on'his family.

[ B] grew fond of classical music.

[ C] recovered from language incompetence.

[ D] enjoyed loud Italian popular music.

The longest ____ in English may contain four consonants, as shown by prompts.

A、word

B、onset

C、nucleus

D、coda

The structure of the sound system involves not only the vowels and consonants --- the segmental features, but also stress and intonation --- the supra-segmental features.()

A.Stops

B.bilabial

C.fricative

D.glides

Which of the following is not true about reduction and contraction？

A.Final consonants are usually not released.

B.Vowels cannot be reduced.

C.Sometimes, initial syllable can be dropped.

D.Auxiliary verbs are usually contracted.

'Consonants all involve the vibration of the vocal folds.()

Consonants are sounds made by a closure or narrowing somewhere in the vocal tract.()

A.ideas… consonants … vowels

B.consonant … sound … image

C.consonants … ideas … actions

D.sound … dialogues … actions