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4.In hostage(抵押品， 人质) situations（情形） the US police forces （警察部门）repeatedly（重复地） play（播放） pop songs （流行音乐）at high（高的） volume（音量， 体积， 册） in order to（为了）
A)put pressure on （给...施加压力）the criminals（罪犯）．
B)distract（转移） the attention（注意力） of the criminals．
C)keep the criminals awake（醒的， 醒，唤醒）．
D)please（使满意） the criminals．
4. A. 细节题。 利用问题句中的特征词（US police forces）， 细节信息结构（pop songs）及被选项中的共有词criminals共同作为答案线索， 在文章中查找答案相关句：
If there is one group of Workers across the Western world who wm 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，au Shops and many offices have what is known as “Piped music1” or “muzak” playing for au 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．It was 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．
（第3题答案相关句）Research shows that repeated hearings of complex pieces of music bring greater enjoyment before becoming tiresome．And that point come mach sooner with simple songs2.
“That’s especially the case with tunes that arc already familiar one that tipping point3 is reached，repeated listening become unpleasant，says professor John Sloboda of UK’s Keele University’s music psychology group．“And the less control you have over what you hear, the less you like it”
（第7段）That′s why police forces in the US often try and resolve(解决， 决心) hostage（人质） situations by playing（播放） pop songs over and over again （反复地）at high volume． Eventually（最后）, it becomes（变得） too（太...而不能...） much for the criminals to stand（站立，忍受） and they give up（放弃）．
答案相关句说：在人质被劫持的情况下，美国警察常常对罪犯用大音量播放流行歌曲， 目的是让罪犯最终难以承受而放弃劫持。
5.According to （根据）the article（文章），which of the following （下列哪项）most appropriately （最恰当地）indicates（显示，指出） the nature（自然， 本质） of the effect（影响）repeated hearing of the same tune（曲调） produces（产生， 引起） on the hearer（听者， 听众）?
A)Social（社会的， 社交的）．
B)Physical（物理的， 身体的）．
C)Psychological（心理的）．
D)Both physical and psychological． | 
