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1、第五篇TrackingDownHIVInthesummerof1980,apatienthadastrangepurplishspotremovedfrombelowhisear.ItwasKaposi'ssarcoma,arareformofskincancer.Thispatientalsohadlymphnodeswellingandexhaustion.InNovember1980,aLosAngelesimmunologistexaminedayoungmanwhohaddiseaseslinkedtoimmunesyste
2、mmalfunctions.ThedoctorhadaT-cellcounttakenofthepatient^blood・T-cellsareatypeofwhitebloodcellthatplaysakeyrole丄inimmuneresponses.ThepatienthadnohelperT-cells.Bytheendof1980,55Americanswerediagnosedwithinfectionsrelatedtoimmunesystembreakdown;fourhaddied.Ayearlaterthedea
3、thtollwas74.IntravenousdrugusershadT-cellabnormalities.Peoplewhohadreceivedbloodtransfusionsshowedsymptomsofimmunesystembreakdown.ByJuly1982,471casesofthedisease,nowcalledAcquiredImmuneDeficiencySyndrome(AIDS),hadbeenreported;184peoplehaddied・InApril1984,Americanvirolog
4、istDr.RobertGalloisolatedthepathogen,ordiseaseproducer,responsiblefor2AIDS.HecalleditHTLV-III.InParis,Dr.LucMontagnieridentifiedavirushecalledLAV.Aninternationalpanelofscientistsdeterminedthatbothmenhadfoundthesamevirus.ItbecameknownasHumanImmunodeficiencyvirus(HIV).Blo
5、odbanksbeganscreeningforHTVin1985,butbythenabout29,000peoplehadbeeninfectedthroughbloodtransfusions.Some12,000hemophiliacshadcontractedHIVthroughblood-clottingproducts.By1995,477,900AmericanshadAIDS;295,500haddied.In1996,researchersannounceddrugsthatreducedHIVininfected
6、people・TodayscientistsaretestingvaccinesandbelievethatifHIVcanbesuppressed,thenperhapsitcanbeeradicated",butitisstillaraceagainsttime.词汇：spotn・地点，斑点，斑块，青春痘lymphn・淋巴结sarcoman.肿瘤，肉瘤，恶性毒瘤exhaustionn.衰竭，耗尽，精疲力竭immunologistn.免疫学家malfunctionn・故障，失灵，疾病countn.计数，计算infectionn・传染
7、病，感染breakdownn.故障，衰弱，崩溃tolln・代价，死亡人数intravenousdrugn.静脉注射药物abnormalitiesn.(abnormality的复数形式)畸形，异常情况bloodtransfusionn.输血symptomn•症状virologistn.病毒学家virusn.病毒paneln.座谈小组，仪表板hemophiliacn・血友病患者vaccinen.疫苗注释：1.playakeyrole...扮演一个关键角色，有至关重要的作用2.beresponsiblefor...对负责,是的原因3.can
8、beeradicated可以被根除的练习：1•Thispassageismainlyabout.AthespreadingofthediseaseknownasHIVBtheworkofDr.RobertGalloCin
