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Complete silence is found only in laboratories called anechoic rooms. The walls and ceilings, made of blocks of special sound-su
Complete silence is found only in laboratories called anechoic rooms. The walls and ceilings, made of blocks of special sound-su
admin
2015-07-15
27
问题
Complete silence is found only in laboratories called anechoic rooms. The walls and ceilings, made of blocks of special sound-sucking materials, are more than three feet thick, while floor coverings are six-foot layers of feathers or cotton wool. Silence here can be as painful to the ears as the din (continuous loud noise) of a steelworks or a rocket blast-off, yet scientists get used to this and stay in these silent rooms for hours at a time, using microphones and electronic equipment to test the various materials being developed to make the world a less noisy place.
Architects have used scientific discoveries to solve noise problems in a number of ways. Walls are hollowed (having empty space inside) and then filled with sound-sucking materials similar to cotton wool. Extra-thick carpets cover the floors, and thick woolen curtains cover the windows. Air conditioning and heating channels are made less noisy by sound-sucking materials.
Unfortunately, these techniques and others often work too well in some buildings. Noise-proof rooms become almost anechoic and people living in them are disturbed by the lack of sound. One way of handling this problem is to use what they call " sound perfume" — artificial ( similarly produced, made by man) noise is piped to rooms through small loudspeakers.
The article suggests that______.
选项
A、loudspeakers are as important as sound-proofing materials
B、anechoic rooms will be included in all new buildings
C、scientific devices are sometimes too successful
D、all of the abovePassage Four
答案
A
解析
文章暗示______。最后一段中提到,因为某些大楼里降噪的效果太好,人们反而因为缺乏声音而不舒服,这时候需要使用扬声器将声音传输到房间里。故答案为A。
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在职申硕(同等学力)英语
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