精品文档_卫生类-相同项单选集1、Onlythreestrategiesareavailableforcontrollingcancer,prevention,screeningandtreatment.Lungcancercausesmoredeathsthananyothertypeofcancer.Amajorcauseofthediseaseis(51)known;thereisnogoodevidencethatscreeningisofmuchhelp;andtreatmentfailsinabout90percentofallcases.Atpresent,therefore,themainstrategymustbe(52).Thismaynotalwaysbetrue,ofcourse,asforsomeothertypesOfcancer,research(53)thepastfewdecadeshasproduced(orsuggested)someimportantprogressinprevention,screeningortreatment.(54),however,weconsidernotwhatresearchmayonedayofferbutwhattodaysknowledgecouldalreadydeliverthatisnotbeingdelivered,thenthemostpracticableandcost-effectiveopportunitiesforavoidingprematuredeathfromcancer,especiallylungcancer,probablyinvolveneitherscreeningnorimproved(55),butprevention.Thisconclusiondoesnotdependontheunrealisticassumptionthatwecan(56)tobacco.Itmerelyassumesthatwecanreducecigarettesalesappreciablybyraisingpricesorby(57)thetypeofeducationthatalreadyappearstohavehada(58)effectoncigaretteconsumptionbywhite-collarworkers,andthatwecansubstantiallyreducetheamountoftardeliveredpercigarette.Thepracticabilityofpreventingcancerbysuchmeasuresappliesnotonlyinthosecountries,(59)theUS,where,becausecigarettesmokinghasbeencommonfordecades,2530percentofallcancerdeathsnowinvolvelungcancer,butalsointhosewhereithasbecome(60)onlyrecently.InChina,forexample,lungcancer(61)accountsforonlyabout510percentofallcancerdeaths.Thisisbecauseitmaytakeasmuchashalfacentury(62)theriseinsmokingtoincreasetheincidenceoflungcancer.Countrieswherecigarettesmokingisonlynowbecomingwidespreadcanexpectenormousincreasesinlungcancerduringthe1990sorearlyinthenextcentury,(63)prompteffectiveactionistakenagainstthehabit-indeed.,suchincreasesarealreadyplainlyevidentinpartsof(64).Therearefourreasonswhythepreventionoflungcancerisofsuchoverwhelmingimportance:first,thediseaseisextremelycommon,causingmoredeathsthananyothertypeofcancernowdoes;secondly,itisgenerallyincurable;thirdly,effective,practicablemeasurestoreduceitsincidencearealreadyreliablyknown;and,finally,(65)tobaccoconsumptionwillalsohaveasubstantialimpactonmanyotherdiseases.51（）A.hardlyB.neverC.lessD.reliably2、Onlythreestrategiesareavailableforcontrollingcancer,prevention,screeningandtreatment.Lungcancercausesmoredeathsthananyothertypeofcancer.Amajorcauseofthediseaseis(51)known;thereisnogoodevidencethatscreeningisofmuchhelp;andtreatmentfailsinabout90percentofallcases.Atpresent,therefore,themainstrategymustbe(52).Thismaynotalwaysbetrue,ofcourse,asforsomeothertypesOfcancer,research(53)thepastfewdecadeshasproduced(orsuggested)someimportantprogressinprevention,screeningortreatment.(54),however,weconsidernotwhatresearchmayonedayofferbutwhattodaysknowledgecouldalreadydeliverthatisnotbeingdelivered,thenthemostpracticableandcost-effectiveopportunitiesforavoidingprematuredeathfromcancer,especiallylungcancer,probablyinvolveneitherscreeningnorimproved(55),butprevention.Thisconclusiondoesnotdependontheunrealisticassumptionthatwecan(56)tobacco.Itmerelyassumesthatwecanreducecigarettesalesappreciablybyraisingpricesorby(57)thetypeofeducationthatalreadyappearstohavehada(58)effectoncigaretteconsumptionbywhite-collarworkers,andthatwecansubstantiallyreducetheamountoftardeliveredpercigarette.Thepracticabilityofpreventingcancerbysuchmeasuresappliesnotonlyinthosecountries,(59)theUS,where,becausecigarettesmokinghasbeencommonfordecades,2530percentofallcancerdeathsnowinvolvelungcancer,butalsointhosewhereithasbecome(60)onlyrecently.InChina,forexample,lungcancer(61)accountsforonlyabout510percentofallcancerdeaths.Thisisbecauseitmaytakeasmuchashalfacentury(62)theriseinsmokingtoincreasetheincidenceoflungcancer.Countrieswherecigarettesmokingisonlynowbecomingwidespreadcanexpectenormousincreasesinlungcancerduringthe1990sorearlyinthenextcentury,(63)prompteffectiveactionistakenagainstthehabit-indeed.,suchincreasesarealreadyplainlyevidentinpartsof(64).Therearefourreasonswhythepreventionoflungcancerisofsuchoverwhelmingimportance:first,thediseaseisextremelycommon,causingmoredeathsthananyothertypeofcancernowdoes;secondly,itisgenerallyincurable;thirdly,effective,practicablemeasurestoreduceitsincidencearealreadyreliablyknown;and,finally,(65)tobaccoconsumptionwillalsohaveasubstantialimpactonmanyotherdiseases.52（）A.treatmentB.cureC.preventionD.diagnosis3、Onlythreestrategiesareavailableforcontrollingcancer,prevention,screeningandtreatment.Lungcancercausesmoredeathsthananyothertypeofcancer.Amajorcauseofthediseaseis(51)known;thereisnogoodevidencethatscreeningisofmuchhelp;andtreatmentfailsinabout90percentofallcases.Atpresent,therefore,themainstrategymustbe(52).Thismaynotalwaysbetrue,ofcourse,asforsomeothertypesOfcancer,research(53)thepastfewdecadeshasproduced(orsuggested)someimportantprogressinprevention,screeningortreatment.(54),however