题目内容
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Based on the figure, does S depend on the frequency of a sound wave of a given intensity？
A.Yes, because as frequency increases, S increases.
B.Yes, because as frequency increases, S remains constant.
C.No, because as frequency increases, S increases.
D.No, because as frequency increases, S remains
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Nanotechnology(纳米技术 )is the science that deals with doing things in a very small way, and it is being studied and developed all over the world. Micro-machines too small to been seen by the eye are being designed to do many things. And these machines no larger than in diameter than a human hair, are extremely powerful. Many scientists say nanotechnology will produce the next industrial revolution(工业革命 ).
Nano comes from the Greek word dwarf . A nanometer is one-billion of a meter, The period of the end of this sentence can contain about 100 micrometers, which in equal to 100,000 nanometers.To understandthis new technology, we have to get rid of the normal ideas of size and strength.
Minute(微 小 的 ) robots , called “ nanorobots ” are being developed in the revolutionize manufacturing. Instead of cars being produced on assembling line, for example, scientist predict that carscan be built in a giant container into which raw material and machines have beenplaced. Thousands of nanorobots will direct the processandtell the machine what to do.
Micro-machines can also be used to make our environment safer. Today, poison chemicals are stored in containers or transported by trucks or trains. This is sometimes result in dangerous spills. But with nanotechnology, manufacturers could have their own tiny chemical factories. The produce would be no bigger than a sugar cube and would manufacture exactly the amount of chemicals neededat the moment. No chemicals would needto be stored. The workplace would be safer,and the environment would be cleaner.
The author mentions guitar at the beginning of the passagein order to_______ .
A.introduce the knowledge of guitar
B.introduce the topic of nanotechnology
C.show his or her own interest in music
D.describe the craft of making musical instruments
According to the passage,why does the nanotechnology lead to the next industrial revolution？A.Micro-machines are tiny but beautiful
B.Micro-machines are strong but smart
C.Micro-machines are small but powerful
D.Micro-machines are cute and varied
The word dwarf in Pra.3 is closestin meaning to ？A.clever
B.slow
C.quick
D.minute
With nanotechnology, where will carsprobably be produced ？A.On assembleline
B.In huge containers
C.Inside the micro-machines
D.Inside the nanorobots
Which of the following is NOT the causes leading to cleaner environment by adopting nanotechnology？A.There will be less dangerousspills.
B.The amount of produced chemicals can be precisely controlled.
C.Micro-factories neednot store chemicals.
D.The factories will be of large size.
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、startled
B、mere
C、motion
D、sweating
A、260 Hz
B、250 Hz
C、240 Hz
D、235 Hz
A、100 Hz
B、200 Hz
C、400 Hz
D、600 Hz
A、A stopped organ pipe of length L.
B、A stopped organ pipe of length 2L.
C、An open organ pipe of length L.
D、An open organ pipe of length 2L.
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