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In today's world, almost everyone knows that air pollution and water pollution are harmful to people's
health. However, not all know that noise is also a kind of pollution, and that is harmful to humans, too.
People who work and live under noisy conditions usually become deaf. Today, however, scientists
believe that 10 percent of workers in Britain are being deafened by the noise where they work. Many of
the workers who print newspapers and books, and who weave cloth become deaf. Quite a few people
living near airports also become deaf. Recently it was discovered that many teenagers in America could hear no better than 65-year-old people, for these young people like to listen to "pop" music and most of
"pop" music is a kind of noise. Besides, noise produced by jet planes or machines will make people's life
difficult and unpleasant, or even make people ill or even drive them mad. It is said that a continuous noise
of over 85 decibels can cause deafness.
Nowadays the governments in many countries have made laws to reduce or control noise and make it
less than 85 decibels. In China, the government is trying to solve not only air and water pollution problems but also the noise pollution problem.
1. In the world today, not every person knows               .
A. water pollution
B. air pollution
C. harmful pollution
D. noise pollution
2. Today scientists believe that         .
A.90 percent of all the workers in Britain are not suffering from noise
B. 10 percent of all the workers in Britain are working in noisy places
C. 10 percent of all the workers in Britain are being deafened by the noise where they work
D.90 percent of all the workers are free from any noise
3. Those who           usually have poorer hearing.
A. weave cloth
B. sell newspapers
C. like listening to music
D. often travel by plane
4. According to the passage, a continuous noise            can make you deaf.
A. in working places
B. of less than 85 decibels
C. of over 85 decibels
D. of only 85 decibels

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