2017年考研数学(数二)模拟题

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相关推荐：>>>2017年全国硕士研究生报名指导专题>>>2017年考研报名时间、考研报名入口专题>>>全国各地2017年考研报考点汇总>

相关推荐：>>>2017年全国硕士研究生报名指导专题>>>2017年考研报名时间、考研报名入口专题>>>全国各地2017年考研报考点汇总>

相关推荐：>>>2017年全国硕士研究生报名指导专题>>>2017年考研报名时间、考研报名入口专题>>>全国各地2017年考研报考点汇总>

相关推荐：>>>2017年全国硕士研究生报名指导专题>>>2017年考研报名时间、考研报名入口专题>>>全国各地2017年考研报考点汇总>

相关推荐：>>>2017年全国硕士研究生报名指导专题>>>2017年考研报名时间、考研报名入口专题>>>全国各地2017年考研报考点汇总>

At18，AshanthiDeSilvaofsuburbanClevelandisalivingsymbolofoneofthegreatintellectualachievementsofthe20thcentury.Bornwithanextremelyrareandusuallyfataldisorderthatleftherwithoutafunctioningimmunesystem(the“bubble-boydisease，”namedafteranearliervictimwhowaskeptaliveforyearsinasterileplastictent)，shewastreatedbeginningin1990witharevolutionarynewtherapythatsoughttocorrectthedefectatitsverysource，inthegenesofherwhitebloodcells.Itworked.Althoughherlastgene-therapytreatmentwasin1992，sheiscompletelyhealthywithnormalimmunefunction，accordingtooneofthedoctorswhotreatedher，W.FrenchAndersonoftheUniversityofSouthernCalifornia.Researchershavelongdreamedoftreatingdiseasesfromhemophiliatocancerbyreplacingmutantgeneswithnormalones.Andthedreamingmaycontinuefordecadesmore.“Therewillbeagene-basedtreatmentforessentiallyeverydisease，”Andersonsays，“within50years.”It'snotentirelyclearwhymedicinehasbeensoslowtobuildonAnderson'searlysuccess.TheNationalInstitutesofHealthbudgetofficeestimatesitwillspend$432millionongene-therapyresearchin2005，andthereisnoshortageofpromisingleads.Thetherapeuticgenesareusuallydeliveredthroughvirusesthatdon'tcausehumandisease.“ThevirusissortoflikeaTrojanhorse，”saysRonaldCrystalofNewYorkPresbyterian/WeillCornellMedicalCollege.“Thecargoisthegene.”AttheUniversityofPennsylvania'sAbramsonCancerCenter，immunologistCarlJunerecentlytreatedHIVpatientswithageneintendedtohelptheircellsresisttheinfection.AtCornellUniversity，researchersarepursuinggene-basedtherapiesforParkinson'sdiseaseandararehereditarydisorderthatdestroyschildren'sbraincells.AtStanfordUniversityandtheChildren'sHospitalofPhiladelphia，researchersaretryingtofigureouthowtohelppatientswithhemophiliawhotodaymustinjectthemselveswithexpensiveclottingdrugsforlife.Animalexperimentshaveshowngreatpromise.Butsomehow，thingsgetlostinthetranslationfromlaboratorytopatient.Inhumantrialsofthehemophiliatreatment，patientsshowaresponseatfirst，butitfadesovertime.Andthefieldhasstillnotrecoveredfromthesetbackitsufferedin1999，whenJesseGelsinger，an18-year-oldwithararemetabolicdisorder，diedafterreceivinganexperimentalgenetherapyattheUniversityofPennsylvania.Someexpertsworrythatthefieldwillbetarnishedfurtherifthenextpeopletobenefitarenotpatientsbutathletesseekinganedge.Thissummer，researchersattheSalkInstituteinSanDiegosaidtheyhadcreateda“marathonmouse”byimplantingagenethatenhancesrunningability;already，officialsattheWorldAnti-DopingAgencyarepreparingtotestathletesforsignsof“genedoping.”Buttheprincipleisthesame，whetheryou'retryingtohelpahealthyrunnerrunfasterorallowamuscular-dystrophypatienttowalk.“Everybodyrecognizesthatgenetherapyisaverygoodidea，”saysCrystal.“Andeventuallyit'sgoingtowork.”1.ThecaseofAshanthiDesilvaismentionedinthetextto____________.[A]showthepromiseofgene-therapy[B]giveanexampleofmoderntreatmentforfataldiseases[C]introcetheachievementofAndersonandhisteam[D]explainhowgene-basedtreatmentworks2.Anderson‘searlysuccesshas________________.[A]greatlyspeededthedevelopmentofmedicine[B]broughtnoimmediateprogressintheresearchofgene-therapy[C]promisedacuretoeverydisease[D]madehimanationalhero3.Whichofthefollowingistrueaccordingtothetext?[A]Ashanthineedstoreceivegene-therapytreatmentconstantly.[B]Despitethehugefunding，generesearcheshaveshownfewpromises.[C]Therapeuticgenesarecarriedbyharmlessviruses.[D]Gene-dopingisencouragedbyworldagenciestohelpathletesgetbetterscores.4.Theword“tarnish”(line5，paragraph4)mostprobablymeans____________.[A]affect[B]warn[C]trouble[D]stain5.Fromthetextwecanseethattheauthorseems___________.[A]optimistic[B]pessimistic[C]troubled[D]uncertain答案：ABCDA

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