2022年考研英语阅读理解专项练习003

2022年考研英语阅读理解专项练习003Bothresearchgroups-attheMedicalBiologyInstituteinLaJollaandatStandfordUniversity-startedwithaspecialstrainofmicethatarewithoutanimmunesystem.TheLaJollascientistsinjectedthemicewithhumanBcellsandTcells,whitebloodcellsthataremajorcomponentsoftheimmunesystem.Thecellsreproducedinthemice’sbodiesandmigratedthroughouttheanimals’circulatorysystems.

TheStanfordresearchersimplantedhumanfetallivaltissues,thymusglandtissues,andlymphnodes,intothemice.Inthemice’bodies,thelivercellsproducedstemcells,whichdevelopintothevariouskindsofbloodcells.TheimplantedtissuesconvertedthestemcellsintoBcellsandTcells.

Themicewithimmunesystemtransplantsbybothresearchteamswerefullyprotectedagainstinfectiousdisease.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