However,the human ear does not judge clearly the degree of loudness of a noise.A sound ten decibels louder than another one is felt as twice as loud, when, in fact, it is ten times louder.
72
But it is not only our hearing that is harmed.It has been known that loud noises,over a period of time, cause loss of sleep, anger, and many other problems.
73
Can anything be done to make our world more quiet? We know how to build quieter machines,if the public wants them.But shop assistants say that people who buy motorbikes like the loudest ones because they sound more loudly.
74
In America the drivers in some cities are fined(罚款)fifty dollars for honking(打喇叭); they may lose their right to drive if they do it again.People who carry noisy radios in public places may lose them if they are caught with them.
75
Even so, say the scientists, in twenty years the cities will be twice as loud as they are today because of the increase of the population.People will have to shout to be heard at the dinner table. Unless, of course, they have all become completely deaf!
A.Some countries are trying to make laws.
B.People will become completely deaf in the future.
C.When a sound is getting louder and louder,our ears are in danger.
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