2022GMAT考试阅读题练习.docx

2022GMAT考试阅读题练习GMAT考试阅读题练习Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,someepidemicsarecausedbybacteriaandvirusesthathaveundergonenosignificantgeneticchange.Inanalyzingthelatter,scientistshavediscoveredtheimportanceofsocialandecologicalfactorstoepidemics.Poliomyelitis(poliomyelitis:n.小儿麻痹症,急性骨髓灰白质炎),forexample,emergedasanepidemicintheUnitedStatesinthetwentiethcentury;bythen(bythen:到那时候),modernsanitationwasabletodelayexposuretopolio(POLIOMYELITIS)untiladolescenceoradulthood,atwhichtimepolioinfectionproducedparalysis.Previously,infectionhadoccurredduringinfancy,whenittypicallyprovidedlifelongimmunitywithoutparalysis.Thus,thehygienethathelpedpreventtyphoidepidemicsindirectlyfosteredaparalyticpolioepidemic.AnotherexampleisLymedisease,whichiscausedbybacteriathataretransmittedbydeerticks.ItoccurredonlysporadicallyduringthelatenineteenthcenturybuthasrecentlybecomeprevalentinpartsoftheUnitedStates,largelyduetoanincreaseinthedeerpopulationthatoccurredsimultaneouslywiththegrowthofthesuburbsandincreasedoutdoorrecreationalactivitiesinthedeer’shabitat.Similarly,anoutbreakofdenguehemorrhagicfeverbecameanepidemicinAsiainthe1950’sbecauseofecologicalchangesthatcausedAedesaegypti,themosquitothattransmitsthedenguevirus,toproliferate.ThestageisnowsetintheUnitedStatesforadengueepidemicbecauseoftheinadvertentintroductionandwidedisseminationofanothermosquito,Aedesalbopictus.1.Thepassagesuggeststhatalackofmodernsanitationwouldmakewhichofthefollowingmostlikelytooccur?(A)AnoutbreakofLymedisease(B)Anoutbreakofdenguehemorrhagicfever(C)Anepidemicoftyphoid(D)Anepidemicofparalyticpolioamonginfants(C)(E)Anepidemicofparalyticpolioamongadolescentsandadults2.Accordingtothepassage,theoutbreakofdenguehemorrhagicfeverinthe1950’soccurredforwhichofthefollowingreasons?(A)ThemosquitoAedesaegyptiwasnewlyintroducedintoAsia.(B)ThemosquitoAedesaegyptibecamemorenumerous.(C)Themosqui本文来源：网络收集与整理，如有侵权，请联系作者删除，谢谢！