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一)原因 Anumberoffactorsareaccountableforthissituation. Anumberoffactorsmightcontributeto(leadto)(accountfor)thephenomenon. Thephenomenonmainlystemsfromthefactthat... Thefactorsthatcontributetothissituationinclude... Thechangein...largelyresultsfromthefactthat... Wemayblame...,buttherealcausesare... Oneofthemostcommonfactors(causes)isthat... Anothercontributingfactor(cause)is... Perhapstheprimaryfactoristhat… Butthefundamentalcauseisthat 二)比较 1.Theadvantagefaroutweighthedisadvantages. 2.TheadvantagesofAaremuchgreaterthanthoseofB. 3.AmaybepreferabletoB,butAsuffersfromthedisadvantagesthat... 4.Itisreasonabletomaintainthat...butitwouldbefoolishtoclaimthat... 5.Forallthedisadvantages,ithasitscompensatingadvantages. 7.AandBhasseveralpointsincommon. 8.AbearssomeresemblancestoB. 9.However,thesameisnotapplicabletoB. 10.AandBdifferinseveralways. 11.Evidently,ithasbothnegativeandpositiveeffects. 12.Peopleusedtothink...,butthingsaredifferentnow. 13.ThesameistrueofB. 14.WonderingasAis,ithasitsdrawbacks. 15.ItistruethatA...,butthechieffaults(obviousdefects)are... 三)批驳 1)Itistruethat...,butonevitalpointisbeingleftout. 2)Thereisagrainoftruthinthesestatements,buttheyignoreamoreimportantfact. 3)Somepeoplesay...,butitdoesnotholdwater. 4)Manyofushavebeenundertheillusionthat... 5)Acloseexaminationwouldrevealhowridiculousthestatementis. 6)Itmakesnosensetoarguefor... 7)Toomuchstressplacedon...mayleadto... 8)Suchastatementmainlyrestsontheassumptionthat... 9)Contrarytowhatiswidelyaccepted,Imaintainthat... 四)后果 1.Itmaygiverisetoahostofproblems. 2.Theimmediateresultitproducesis... 3.Itwillexerciseaprofoundinfluenceupon... 4.Itsconsequencecanbesogreatthat... 五)举例 1)Agoodcaseinpointis... 2)Asanillustration,wemaytake... 3)Suchexamplesmightbegiveneasily. 4)...isoftencitedasanexample. 六)证明 1)Noonecandenythefactthat... 2)Theideaishardlysupportedbyfacts. 3)Unfortunately,noneoftheavailabledatashows... 4)Recentstudiesindicatethat... 5)Thereissufficientevidencetoshowthat... 6)Accordi