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托福tpo26综合写作

第一篇：托福tpo26综合写作IntermswhetherthezebramusselwillexertnegativeinfluenceonNorthAmerican,thepassageandlecturearecontradictorytoeachother.Theauthorbelievesthatzebramusselmightdoharmthelocalspeciesastheyarrivedwhilethelecturerholdsadifferentopinion.Firstofall,theauthormakesapointthatthehistoryeventssuggestthezebramussel'sinvasionisunstoppable.Inthepast,humantransportationmakesitpossibleforzebramusselspreadaroundthewholeEuropeanditislikelytohappenagaininNorthAmerican.However,thelecturerdemonstratesadifferentideathatachangemadeinthe“ballastwater”willpreventtheinvasionofzebramusselfromcontinuing.Hesaysthatifwerefillthe“ballastwater”withoceanwater,themusselwillnolongersurvivebecausethesalinewatermightprobablykillthemall.Second,contrarytothebeliefinthepassagethatzebramusselisabletoconquerthenewhabitatduetotheirhighreproductionratesandadaptationability,aswellaslackingpredator,thelecturersaysthatthehypothesismadebyauthorisnottrue.Hementionsthattherearemanylocalbirdwilleatthezebramusselasamajorprey.Asaresult,thezebramusselisunlikelytodominatethenewhabitat.Finally,regardingwhetherthezebramusselwillcausethedeclineinthefishpopulationsincetheymaycompeteforfoodsuchasplanktonwithfishspecies.Theauthorthinksitisapossibleconsequencebroughtbyzebramussel.However,thelecturerrefutesitthatthemusselcan'treducethefishpopulationbecausetheyprovideenoughnutrientforbottomlivingfish.第二篇：tpo综合写作26综合写作26ReadingThezebramussel,afreshwatershellfishnativetoEasternEurope,haslongbeenspreadingoutfromitsoriginalhabitatsandhasnowreachedpartsofNorthAmerica.TherearereasonstobelievethatthisinvasioncannotbestoppedandthatitposesaseriousthreattofreshwaterfishpopulationsinallofNorthAmerica.First,thehistoryofthezebramussels’spreadsuggeststhattheinvasionmightbeunstoppable.Itisaprimeexampleofaninvasionmadepossiblebyhumantransportation.Fromthezebramussel’soriginalhabitatsinEasternEurope,shipshelpedspreaditoutalongnewcanalsbuilttoconnectEurope’swaterways.Themusselcanattachitselftoaship’sbottomorcansurviveinthe