2000年1月大学英语四级考试试题(3)_新闻中心

2000年1月大学英语四级考试试题(3)

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Questions 36 to 40 are based on thefollowingpassage: 　　Why does cream go bad faster than butter? Some researchersthinkthey the answer，and it comes down to the structure of thefood，notits chemical composition - a finding that could help ridsomeprocessed foods of chemical preservatives.C ream and buttercontainpretty much the same substances，so why cream should sourm uchfaster has been a mystery.Both are emulsions -tinyglobules(小球)of one liquid evenly distributed throughoutanother.Thedifference lies in whats in the globules and whats inthesurrounding liquid，says Brocklehurst，who led theinvestigation.Incream，fatty globules and whats in the surround ingliquid，saysBrocklehurst，who led the investigation.In cream，fattyglobul esdrift about in a sea of water.In butter，globules of awaterysolution are l ocked away in a sea of fat.The bacteria whichmakethe food go bad prefer to li ve in the watery regions ofthemixture.”This means that in cream，the bacteria are free togrowthroughout the mixture，”he says.When the situation is reversed，thebacteria are locked away in compartments (密封仓) buried dee pin thesea of fat.Trapped in this way，individual colonies cannotspreadand rapidly run out of nutrients.They also slowly poisonthemselveswith their wast e products.”In butter，you get a self -limitingsystem which stops the bacteri a growing，”saysBrocklehurst.Theresearchers are already working with food companies keen to see iftheir products can be made resistant tobacterial attack t hroughalterations to the foodsstructure.Brocklehurst believes it willbe pos sible to make theemulsions used in salad cream，forinstance，more like that inbutter.The key will be to do this whilekeeping the salad creamliquid and not turning it into a solidlump.36. The significance ofBrocklehursts research is that ______. 　　A) it suggested a way to keep some foods freshwithoutpreservatives 　　B) it discovered tiny globules in both cream and butter 　　C) it revealed the secret of how bacteria multiply in creamandbutter 　　D) it found that cream and butter share the samechemicalcomposition37. According to the researchers.cream soursfaster thanbutter because bacteria_____ . 　　A) are more evenly distributed in cream 　　B) multiply more easily in cream than is butter 　　C) live on less fat in cream than in butter 　　D) produce less waste in cream t han in butter38. AccordingtoBrocklehurst，we can keep cream fresh by ______ . 　　A) removing its fat B) killing the bacteria 　　C) reducing its water contentD) altering its structure39.Theword“colonies”(Line 2，.4) refers to ______ . 　　A) tiny globules B) watery regions 　　C) bacteria communities D) little compartments40.Commercialapplication of the research finding will be possible if saladcream 　　can be made resistant to bacterial attack ______ . 　　A) by varying its chemical composition B) by turning it intoasolid lump 　　C) while keeping its structure unchanged D) while retainingitsliquid formPart ⅢVocabulary and Structure(20 minutes)Directions:There are 30 incomplete sentences in thispart.For each sentencethere are four choices marked A)，B)，C) and D).Choose the ONEanswer that best completes the sentence.Then markthe correspondingletter on the Anwer Sheet with a single linethrough the centre.41.She ought to stop work；she has a headachebecause she ______ toolong. 　　A) has been reading B) had read C) is reading D) read42.NiagaraFalls is a great tourist ______ drawing millions of visitorseveryyear. 　　A) attentionB) attraction C) appointment D) arrangement43. Idontmind ______ the decision as long as it is not too late. 　　A) you to delay makingB) your delaying making 　　C) your delaying to makeD) you delay to make44. Thehopesgoals，fears and desires widely between men and women，betweentherich 　　and the poor. 　　A) alter B) shiftC) transfer D) vary45. Corn originated in theNewWorld and thus was not known in Europe until Columbus 　　found it ______ in Cuba. 　　A) being cultivated B) been cultivated C) having cultivatedD)cultivating46. The sale usually takes place outside thehouse,withthe audience _____ on benches，　　chairs or boxes. 　　A) having seated B) seating C) seated D) having beenseated47.This kind of glasses manufactured by experienced craftsmen______comfortably. 　　A) is worn B) wears C) wearing D) are worn48Some diseasesare_____ by certain water animals. 　　A) transplantedB) transformed C) transported D)transmitted49.Wouldnt you rather your child _______ to bedearly? 　　A) go B) went C) would go D) goes50. Although Anne is happywithher success she wonders _____ will hap pen to her 　　private life. 　　A) that B) what C) it D) this51. The words of his oldteachercenter a _____ impression on his mind.He is still 　　influenced by them. 　　A) long B) lively C) lasting D) liberal52. Mikes uncleinsists______ in this hotel. 　　A) staying not B) not to stay C) that he would not stay D) thathenot stay53. We agreed to accept ______ they thought was thebesttourist guide. 　　A) whatever B) whomever C) whicheverD) whoever54. It is our______policy that we will achieve unity through peacefulmeans. 　　A) consistent B) continuous C) considerateD) continual55.Between1974 and 1997，the number of overseas visitors expanded______27%. 　　A) byB) forC) to D) in56. Although many people view conflictasbad，conflict is sometimes useful it forces 　　people to test the relative merits of their attitudesarebehaviors. 　　A) by which B) to which C) in that D) so that57. He is______about his chances of winning a gold medal in the Olymp icsnextyear. 　　A) optimistic B) optional C) outstandingD) obvious58. SometimesIwish I ______ in a different time and a different place . 　　A) be living B) were living C) would liveD) would havelived59.The director was critical ______ the way we were doingthework. 　　A) atB) inC)of D) with60. In a sudden ______ of anger，the mantoreup everything within reac h. 　　A) attack B) burstC) splitD) blast61. ______ she realized itwastoo late to go home. 　　A) No sooner it grew dark than B) Hardly did it grow darkthat 　　C) Scarcely had it grown dark than D) It was not untildarkthat62. In Britain people ______ four million tons ofpotatoesevery year. 　　A) swallow B) dispose C) consumeD) exhaust63. Id ______hisreputation with other farmers and business people inthecommunity，　　and then make a decision about whether or not to approvealoan. 　　A) take into account B) account for C) make up for D)makeout64.It is essential that these application forms ______ backasearly as possible. 　　A) must be sent B) will be sent C) are sent D) be sent65.Shecooked the meat for a long time so as to make it ______ enoughtoeat. 　　A) mildB) slight C) lightD) tender66. We take our skin forgranteduntil it is burned ______ repair. 　　A) beyond B) forC) without D) under67. The computer revolutionmayewll change society as ______ as did the Industrial 　　Revolution. 　　A) certainly B) insignificantly C) fundamentally D)comtively68.______ in this way，the situation doesnt seem sodisappointing. 　　A) To look at B) Looking at C) Looked atD) To be looked at69.Alot of ants are always invading my kitchen.They are athorough______ . 　　A) nuisance B) troubleC) worryD) anxiety70. Some women ______agood salary in a job instead of staying home，but they decided 　　not to work for the sake of the family. 　　A) must make B) should have made C) would makeD) couldhavemade【1】【2】【3】【4】