题目内容：
根据材料，回答问题。D
Do you think there is too much noise in our city? If you live near an airport, you will be unhap-py because a plane often makes a loud noise. The sound of planes or heavy vehicles is likely tocause deafness if heard continuously.
However, most people in our city do not seem to mind noise. They like to enjoy music whenthey are doing uninteresting jobs. It is a new danger because pop music, when played through pow-erful amplifiers, can reach 120 decibels at a distance of five feet. A continuous noise of over $5 dec-ibels can cause deafness. It was discovered that many young people in America could hear no betterthan 65-year-old people.
In the past we used to think that only workers in very noisy places would become deaf. For ex-ample, when newspapers and books are being printed, the noise level is over 85 decibels, and someof the workers become deaf. Today, however, scientists believe that l0 percent of the workers inBritain are being deafened by the noise.
Sometimes noise of less than 85 decibels can make some people tired and stressed. We all knowthat too much noise makes life difficult and unpleasant. It can do great harm to people's health andprevent people from working well. Workers in noisy offices are not as efficient as those in quiet of-rices. Noise makes people less efficient. Can anything be done to reduce or control noise?
In Britain the government has made several laws to reduce noise. Though the government hasspent a lot of money in making airports and main roads quieter, many people think that there are still not enough laws. For example, there are no laws to control the noise of machines. In Japan, Ameri-ca and Norway there are such laws. As a result, workers can be given compensation if they becomedeaf.
Some workers become deaf because of________ A．hard work
B．a continuous noise of over 85 decibels
C．powerful amplifiers
D．uninteresting jobs
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