CET6阅读通关班电子教材主讲：屠浩民欢迎使用新东方在线电子教材k《oolearn新东方在线www.koolearn.com教材说明：本电子教材wod文档下面的页码跟教材完全一样，学员只需根据老师说的多少页找到相应的页面学习即可。请提前预习、认真学习、及时复习，祝广大学子考试取得成功！新东方在线www.koolearn.com]CET6通关班网络课堂电子教材系列阅读第一部分阅读理解全真试题Unit 1Part I Reading Comprehension(35 minutes)Directions:There are 4 reading passages in this part.Each passage is followed by some questionsor unfinished statements.For each of them there are four choices marked A),B),C)and D).You should decide on the best choice and mark the corresponding letter onthe Answer Sheet with a single line through the centre.Questions 21 to 25 are based on the following passage:WWe sometimes think humans are uniquely vulnerable to anxiety,but stress seems to affect theimmune defenses of lower animals too.In one experiment,for example,behavioralimmunologist(免疫学家)Mark Laudenslager,at the University of Denver,,gave mild electricshocks to 24 rats.Half the animals could switch off the current by turning a.wheel in theirenclosure,while the other half could not.The rats in the two groups were paired so that each timeone rat turned the wheel it protected both itself and its helpless partner from the shock.Laudenslager found that the immune response was depressed below normal in the helpless ratsbut not in those that could turn off the electricity.What he has demonstrated,he believes,is thatlack of control over an event,not the experience itself,is what weakens the immune system.Other researchers agree.Jay Weiss,a psychologist at Duke University School of Medicine,has shown that animals who are allowed to control unpleasant stimuli don't develop sleepdisturbances or changes in brain chemistry typical of stressed rats.But if the animals areconfronted with situations they have no control over,they later behave passively when faced withexperiences they can control.Such findings reinforce psychologists'suspicions that the experienceor perception of helplessness is one of the most harmful factors in depression.One of the most startling examples of how the mind can alter the immune response wasdiscovered by chance.In 1975 psychologist Robert Ader at the University of Rochester School ofMedicine conditioned(使形成条件反射)mice to avoid saccharin(糖精)by simultaneouslyfeeding them the sweetener and injecting them with a drug that while suppressing their immunesystems caused stomach upsets.Associating the saccharin with the stomach pains,the mice新东方在线www.koolearn.com]CET6通关班网络课堂电子教材系列阅读quickly leamed to avoid the sweetener.In order to extinguish this dislike for the sweetener,Aderreexposed the animals to saccharin,this time without the drug,and was astonished to find thatthose mice that had received the highest amounts of sweetener during their earlier conditioningdied.He could only speculate that he had so successfully conditioned the rats that saccharin alonenow served to weaken their immune systems enough to kill them.21.Laudenslager's experiment showed that the immune system of those rats who could turn offthe electricityA)was alteredC)was weakenedB)was strengthenedD)was not affected22.According to the passage,the experience of helplessness causes rats toA)turn off the electricityB)try to control unpleasant stimuliC)become abnormally suspiciousD)behave passively in controllable situations23.The reason why the mice in Ader's experiment avoided saccharin was that.A)they associated it with stomachachesB)it affected their immune systemsC)it led to stomach painsDD)they disliked its taste24.The passage tells us that the most probable reason for the death of the mice in Ader'sexperiment was that●A)the sweetener was poisonous to themB)their immune systems had been altered by the mindC)they had been weakened psychologically by the saccharinD)they had taken too much sweetener during earlier conditioning课25.It can be concluded from the passage that the immune systems of animalsA)can be altered by electric shocks电B)can be weakened by conditioningC)can be suppressed by drug injections教D)can be affected by frequent doses of saccharin系Questions 26 to 30 are based on the following passage:The destruction of our natural resources and contamination of our food supply continue tooccur,,largely because of the extreme difficulty in affixing(把…周定)legal responsibility onthose who continue to treat our environment with reckless abandon )Attempts to preventpollution by legislation,economic incentives and friendly persuasion have been met by lawsuits,personal and industrial denial and long delays-not only in accepting responsibility,but more2