大学英语四级仔细阅读练习及答案解析(13).doc

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1、大学英语四级仔细阅读练习及答案解析(13)导读：本文大学英语四级仔细阅读练习及答案解析(13)，仅供参考，如果觉得很不错，欢迎点评和分享。　　Questions56to60arebasedonthefollowingpassage.　　ScientistsatWashingtonUniversitySchoolofMedicineintheUSfoundhigherlevelsofproteinS1PR2(磷酸鞘氨醇受体蛋白)intestsonthebrainsoffemalemiceanddeadwomenwithMSthani

2、nmaleequivalents.FourtimesmorewomenthanmenarecurrentlydiagnosedwithMultipleSclerosis(多发性硬化症).　　Expertssaidthefindingwas”reallyinteresting”.MSaffectsthenervesinthebrainandspinalcord，whichcausesproblemswithmusclemovement，balanceandvision.Itisamajorcauseofdisability,anda

3、ffectsabout100，000peopleintheUK.AbnormalimmunecellsaRacknervecellsinthecentralNervoussysteminMSpatients.Thereiscurrentlynocure，A.thoughtherearetreatmentsthatcanhelpintheearlystagesofthedisease.　　ResearchersinMissourilookedatrelapsingremitting(复发缓解型)MS，wherepeoplehaved

4、istinctattacksofsymptomsthattllenfadeawayeitherpartiallyorcompletely.About85%ofallpeoplewithMShavethistype.Scientistsstudiedthebloodvesselsandbrainsofhealthymice，micewithMS，andmicewithoutthegeneforSlPR2，abloodvesselreceptorprotein，toseehowitaffectedMSseverity.TheyA.so

5、100kedatthebraintissuesamplesof20peopleaftertheyhaddied.TheyfoundhighlevelsofS1PR2intheareasofthebraintypicallydamagedby　　MSinbothmiceandpeople.TlleactivityofthegenecodingforS1PR2waspositivelycorrelatedwiththeseverityofthediseaseinmice.thestudysaid.　　ScientistssaidSlP

6、R2couldworkbyhelpingtomaketheblood-brainbarrier,inchargeofstoppingpotentiA.lyharmfulsubstancesfromenteringthebrainandspialfluid.morepermeable.Amorepermeablebarriercouldletattackingcells，whichcauseMS，intothecentralnervoussystem，thestudysaid.Thislink[betweenMSandSlPR2]i

7、scompletelynew一ithasneverbeenfoundbefore.　　DrEmmaGray,oftheMSSociety,said：”Wedon’tyetfullyunderstandwhyMSaffectsmorewomenthanmen,andit’sanareathat’sintriguedscientists，andpeoplewithMS，formanyyears.ShesaidunderstandingthecausesofMSwasa“priority”fortheMSSocietyintheUK.a

8、ndcouldbe“crucial”infindingnewtreatments.　　56.WhatcanweinferfromthelastsentenceinPara.1?　　A.Wbmenaremorelikelytobediagnosedw