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阅读下面的短文。每篇短文的后面有五个问题，每个问题有四个备选答案。请根据短文的内容选择最佳答案。每个试题计3分,共计15分 Silence Please Ifthere is one group of workers across the Western world who will be glad that Christmas is over，that group is shop workers. It is not that they like to complain.They realize that they are going to be rushed off their feet at Christmas.They know that their employers need happy customers，to make their profits that pay their wages.But there is one thing about working in a shop over Christmas，that is too bad to tolerate. That thing is music.These days，all shops and many offices have what is known as.Piped music1or muzakplaying for all the hours that they are open.Muzak has an odd history.During the 1940s，music was played to cows as part of a scientific experiment.Itwas found that cows which listened to simple，happy music produced more milk.Perhaps workers and customers who listened to simple，happy music would be more productive and spend more money. In fact，nobody knows what effect playing muzak in shops has on profits.It is simply something that everybody does.But we are learning more about the effect of constantly repeated hearings of songs on the people who have to hear them all the time. Research shows that repeated hearings of complex pieces of music bring greater enjoyment before becoming tiresome.And that point come much sooner with simple songs2. | 
