Someone is singing next door, but you feel unhappy because her singing is terrible. So you think she is just making noise. We know that too much noise makes people feel terrible.
Scientists are still trying to find out more about noise, but already it is known that a noise of over 85 decibels(分贝) can make some people tried and anxious(焦虑的).
In the past we thought only workers in very noisy places became deaf easily. Today, scientists believe that 10% of all workers in Britain become deaf in their work.
There are also new dangers from noise. Pop music, for example, can reach 120 decibels when it is played loudly five feet away! Only a plane can make such loud noise when it takes off.
There was an experiment in the United States. Some people would be given a lot of money if they stood below a jet when it was taking off over their heads. No one got the money after the jet flew past because all of them died in the noise.
People can’t pay their attention on what they are doing when there is much noise. Workers in noisy offices, for example, do their work more slowly than workers in quiet offices. Another study shows that workers in factories can do dull(枯燥的) jobs better when lively music is played for them. 

Topic	Too much noise makes people feel ___1____
Sources(源) of noise	. terrible singing . pop music when it is played ___2____ nearby . loud noise made by a plane taking off overhead
Harm of noise	. A noise of over 85 decibels can make people feel tired and anxious. . 10%of all workers in Britain become ___3___ in their work. . Some people lose their ____4___ in the noise of a plane taking off over their heads. . Workers in noisy places do their work more ___5___ than those in quiet places.