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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 writer implies that______.
选项 A、untrained people can not stay long in anechoic rooms
B、performing experiments in anechoic rooms can be a frightening experience
C、architects make practical use of the information gathered by scientists
D、scientists do not care for noise problem
答案B
解析 作者暗示 。推理题。原文第一段中说“这种安静对于耳朵来说不亚于钢厂里或火箭发射时发出的巨大噪音”，可以想象在这样的环境里做实验是很恐怖的事情。故答案为B。
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