题型分类-day5刷题训练营作业

Thereisagreatdealofgeographicalvariationinthefrequencyofmanysurgicalprocedures-uptotenfoldvariationperhundredthousandpeopleamongdifferentareasinthenumbersofhysterectomies,prostatectomies,andTosupportaconclusionthatmuchofthevariationisduetounnecessarysurgicalprocedures,itwouldbemostimportanttoestablishwhichoftheAAlocalboardofreviewateachhospitalexaminestherecordsofeveryoperationtodeterminewhetherthesurgicalprocedurewasnecessary.分析A选项：BThevariationisunrelatedtofactors(otherthanthesurgicalproceduresthemselves)thatinfluencetheincidenceofdiseasesforwhichsurgerymightbeconsidered.CThereareseveralcategoriesofsurgicalprocedure(otherthanhysterectomies,prostatectomies,andtonsillectomies)thatareoftenperformedDForcertainsurgicalprocedures.itisdifficulttodetermineaftertheoperationwhethertheprocedureswerenecessaryorwhetheralternativetreatmentwouldhavesucceeded.EWithrespecttohowoftentheyareperformedunnecessarily,hysterectomies,prostatectomies,andtonsillectomiesarerepresentativeofsurgicalproceduresingeneral.Studieshaveshownthatelderlypeoplewhopracticeareligionaremuchmorelikelytodieimmedia yafteranimportantreligiousholidayperiodthan ybeforeone.Researchershaveconcludedthatthewilltolivecanprolonglife,atleastforshortperiodsoftime.Whichofthefollowing,iftrue,wouldmoststrengthentheresearchers'AElderlypeoplewhopracticeareligionarelesslikelytodieimmedia beforeorduringanimportantreligiousholidaythanatanyothertimeoftheBElderlypeoplewhopracticeareligionappeartoexperiencelessanxietyattheprospectofdyingthandootherpeople.CSomeelderlypeoplewhodopracticeareligionlivemuchlongerthanmostelderlypeoplewhodonot.DMostelderlypeoplewhoparticipateinreligiousholidayshavedifferentreasonsforparticipatingthanyoungpeopledo.EManyreligionshaveimportantholidaysinthespringandfall,seasonswiththelowestdeathratesforelderlypeople.Thetraditionaltreatmentofstrepinfectionshasbeenaseven-daycourseofantibiotics,eitherpenicillinorerythromycin.However,sincemanypatientsstoptakingthosedrugswithinthreedays,reinfectioniscommonincaseswherethosedrugsareprescribed.Anewantibioticrequiresonlyathree-daycourseoftreatment.Therefore,reinfectionwillprobablybelesscommonincaseswherethenewantibioticisprescribedthanincaseswhereeitherpenicillinorerythromycinisprescribed.Whichofthefollowing,iftrue,moststrengthenstheASomeofthepeoplewhoareallergictopenicillinarelikelytobeallergictothenewantibiotic.BAcourseoftreatmentwiththenewantibioticcostsaboutthesameasacourseoftreatmentwitheitherpenicillinorerythromycin.CThenewantibiotichasbeenshowntobeeffectiveineradicatingbacterialinfectionsotherthanstrep.DSomephysicianshavealreadybeguntoprescribethenewantibioticinsteadofpenicillinorerythromycinforthetreatmentofsomestrepinfections.DERegardlessofwhethertheytakeatraditionalantibioticorthenewone,mostpatientsfeelfullyrecoveredaftertakingthedrugforthreedays.Macrophagesarecellsthatplayaroleintheresponseoftheimmunesystemofmiceandothermammalstoinvasiveorganismssuchasbacteria.Unlikeothermice,micethataregeneticallyincapableofmakingtheseparticularcellsdonotshowelevatedlevelsofnitrateswheninfectedwithThestatementsabove,iftrue,providethemostsupportforwhichofthefollowingconclusions?AMicethatareunableeithertomakemacrophagesortomaketheminsufficientnumberswillprotectthemselvesfrombacterialinfectionsinsomeotherway.BMicethatshowelevatedlevelsofnitratescaneasilyfightoffmosttypesofbacterialinfections.CInmice,macrophagesplayaroleintheproductionofnitratesorinhibitaprocessbywhichnitratesarebrokendownorotherwiseeliminated.DWhenahealthymouse esinfectedwithaninvasiveorganism,thenumberofmacrophagesinthemouse'sbodydecreases.EInjectionsofnitratesintomicethatlackmacrophageswillnotenhancetheabilityoftheseanimals'immunesystemstofightoffinfection.Inresponsetoviralinfection,theimmunesystemsofmicetypicallyproduceantibodiesthatdestroythebybindingtoproteinsonitssurface.Miceinfectedwithaherpesgenerallydevelopkeratitis,adegenerativediseaseaffectingpartoftheeye.Sinceproteinsonthesurfaceofcellsinthispartoftheeyecloselyresemblethoseontheherpessurface,scientistshypothesizethatthesecasesofkeratitisarecausedbyantibodiestoherpes.Whichofthefollowing,iftrue,givesthegreatestadditionalsupporttothescientists'hypothesis?AOthertypesofhavesurfaceproteinsthatcloselyresembleproteinsfoundinvariousorgansofmice.BTherearemicethatareunabletoformantibodiesinresponsetoherpesinfections,andthesemicecontractherpesatroughlythesamerateasotherCMicethatareinfectedwithaherpesbutdonotdevelopkeratitisproduceasmanyantibodiesasinfectedmicethatdodevelopkeratitis.分析C选项：DTherearemicethatareunabletoformantibodiesinresponsetoherpesinfections,andthesemicesurvivetheseinfectionswithouteverdeveloEMicethathaveneverbeeninfectedwithaherpescansometimesdevelopkeratitis.Acompanyplanstodevelopaprototypeweedingmachinethatusescuttingbladeswithopticalsensorsandmicroprocessorsthatdistinguishweedsfromcropplantsbydifferencesinshadeofcolor.TheinventorofthemachineclaimsthatitwillreducelaborcostsbyvirtuallyeliminatingtheneedformanualWhichofthefollowingisaconsiderationinfavorofthecompany'simplementingitsplantodeveloptheprototype?AThereisaconsiderabledegreeofvariationinshadeofcolorbetweenweedsofdifferentspecies.BTheshadeofcolorofsomeplantstendstochangeappreciablyoverthecourseoftheirgrowingseason.CWhencropsareweededmanually,overallsizeandleafshapearetakenintoaccountindistinguishingcropplantsfromweeds.DSelectionandgeneticmanipulationallowplantsofvirtuallyanyspeciestobeeconomicallybredtohaveadistinctiveshadeofcolorwithoutalteringtheirothercharacteristics.EFarmlaborerswhoareresponsibleforthemanualweedingofcropscarryoutotheragriculturaldutiesattimesinthegrowingseasonwhenextensiveweedingisnotnecessary.Peoplewhohavespentalotoftimeincontactwithanimalsoftendevelopanimal-inducedallergies,someofthemquiteserious.Inasurveyofcurrentemployeesinmajorzoos,about30percenthadanimal-inducedallergies.Basedonthissample,expertsconcludethatamongmembersofthegeneralpopulationwhohavespentasimilarlylargeamountoftimeinclosecontactwithanimals,thepercentagewithanimal-inducedallergiesisnot30percentbutsubstantiallymore.Whichofthefollowing,iftrue,providesthestrongestgroundsfortheexperts'AAzooemployeewhodevelopsaseriousanimal-inducedallergyisverylikelytoswitchtosomeotheroccupation.BAzooemployeeismorelikelythana inthegeneralpopulationtokeeponeormoreanimalpetsathomeCThepercentageofthegeneralpopulationwhoselevelofexposuretoanimalsmatchesthatofazooemployeeisquitesmall.DExposuretodomesticpetsis,onthewhole,lesslikelytoanimal-inducedallergythanexposuretomanyoftheanimalskeptinEZooemployeesseldomwearprotectivegearwhentheyhandleanimalsintheircare.Whenanairplaneistakenoutofserviceformaintenance,itisoftenrepaintedaswell,andduringthere