考研英语阅读理解专项练习003

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    ThetransplantationoffunctioninghumanimmunesystemsintomicewasreportedbytwoCaliforniaresearchteamsinSeptember1988.Themiceshouldhavemanyimportantusesinmedicalscience,suchasenablingresearcherstotesttreatmentsagainstanumberofdiseasesandtostudytheeffectsofinfectiousmicroorganisms-includingtheAIDSvirus-onthehumanimmunesystem.
Bothresearchgroups-attheMedicalBiologyInstituteinLaJollaandatStandfordUniversity-startedwithaspecialstrainofmicethatarewithoutanimmunesystem.TheLaJollascientistsinjectedthemicewithhumanBcellsandTcells,whitebloodcellsthataremajorcomponentsoftheimmunesystem.Thecellsreproducedinthemice’sbodiesandmigratedthroughouttheanimals’circulatorysystems.
TheStanfordresearchersimplantedhumanfetallivaltissues,thymusglandtissues,andlymphnodes,intothemice.Inthemice’bodies,thelivercellsproducedstemcells,whichdevelopintothevariouskindsofbloodcells.TheimplantedtissuesconvertedthestemcellsintoBcellsandTcells.
Themicewithimmunesystemtransplantsbybothresearchteamswerefullyprotectedagainstinfectiousdisease.Ordinarily,miceofthestrainusedbythescientistsdiesoonafterbirthunlesstheyarekeptinasterile(无菌的)environment.
Thepurposeoftheresearchesinthosetwouniversitieswasto_____．
A．usemousebloodtotreatmanydiseases
B．usehumanbloodtocuresickmice
C．findouthowhumanimmunesystemmightbeaffected
D．findoutifhumanimmunesystemwassimilartothatofmice
Thetworesearchersweresimilarinthatbothresearchgroups_____．
A．hadthesameobjectivetotheirresearches
B．usedthesameproceduresintheirresearches
C．injectedthesamekindofbloodcellsintothemice
D．usedthesameexperimentalinstrumentintheirwork
Finallythetworesearches_____．
A．hadquitedifferentfindings
B．gotsimilarfindings
C．failedsincethemicesoondied
D．hadnoparticularresults
ComparedwithStandfordUniversityresearchers,thoseintheotheruniversity_____．
A．experimentedwithfewerkindsofbloodcells
B．usedalessadvancedmethod
C．employedamoredirectmethod
D．gotlessconvincingresults