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  3. 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

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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 above
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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