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1、托福作文写作范文详解ReadingInthepastcentury,thesteadygrowthofthehumanpopulationandthecorrespondingincreaseinagricultureandpesticideusehavecausedmuchharmtowildlifeintheUnitedStatesbirdsinparticular.Unfortunatelyforbirds,thesetrendsarelikelytocontinue,withtheresultthatthenumberofbirdsintheUnitedStateswillnecess
2、arilydecline.Firstzashumanpopulationsandsettlementscontinuetoexpand,birdsnaturalhabitatswillcontinuetodisappear.Forestszwetlands,andgrasslandswillgivewaytoevermorehomes,malls,andoffices.Asthetraditionalareassuitableforbirdskeepdecreasing,sowillthesizeofthebirdpopulationsthatdependonthosevanishinghab
3、itats.Second,agriculturalactivitiesmustincreasetokeeppacewiththegrowinghumanpopulation.Thegrowthofagriculturewillalsoresultinthefurtherdestructionofbirdhabitatsasmoreandmorewildernessareasareconvertedtoagriculturaluse.Asaresult,birdpopulationsinruralareaswillcontinuetodecline.Third,ashumansettlement
4、sexpandandagricultureincreases,theuseofchemicalpesticideswillalsoincrease.Pesticidesarepoisonsdesignedtokillagriculturalandhomegardenpestszsuchasinsects,butinevitably,pesticidesgetintothewaterandintothefoodchainforbirdswheretheycanharmbirds.Birdsthateatthepoisonedinsectsordrinkcontaminatedwatercandi
5、easaresult,andevenifpesticidesdonotkillbirdsoutright,theycanpreventthemfromreproducingsuccessfully.Sopesticideshavesignificantlycontributedtodeclinesinbirdpopulation,andbecausetherewillcontinuetobeaneedtocontrolagriculturalpestsinthefuture,thisdeclinewillcontinue.ListeningThepassageclamsthattherewil
6、lbefewerandfewerbirdszbuttheargumentsusedtosupportthisclaimareunconvincing.First,itstruethaturbangrowthhasbeenbadforsometypesofbirds,buturbandevelopmentactuallyprovidesbetterandlargerhabitatsforothertypes,somuchsothatcityandsuburbandwellersoftencomplainaboutincreasedbirdspopulationsseagullsatlandfil
7、ls,pigeonsonthestreetsandsoon.Evenbirdslikehawksandfalconscannowbefoundincities,wheretheypreyontheincreasingpopulationsofpigeonsandrodents.Soitsnotgoingtobeastoryofuniformdeclineofbirdpopulationsinthefuture.Somepopulationsmayshrink,butotherswillgrow.Asforagriculture,itstruethatittoowillincreaseinthe
8、future,butnotinthewayassumedbythereadingpassage.Thetruthis,intheUnitedStates,lessandlesslandisbeingusedforagricultureeveryyear.Increasinginagriculturalproductionhaveresultedfromandwillcontinuetoresultfromtheintroductionofnewzmoreproductivevarietiesofcrops.ThesenewcropsproducemorefoodperunitofIandzan
9、dasaresult,there1snoneedtodestroywildernessareas.Andthird,whileitscertainlytruethattraditionalpesticideshavebeendestructivetobirds,itsincorrecttoprojectthishistoryintothefuture.Nowthatpeopleareawareofthepossibleconsequencesoftraditionalpesticides,twochangeshaveoccurred.Firstznewandmuchlesstoxicpesti
10、cideshavebeendeveloped,andthat,simportant.Second,andperhapsmoreimportantlythereisagrowingtrendtodevelopmorepestresistantcrops,cropsthataregeneticallydesignedtobeunattractivetopests.Pestresistantcropsgreatlyreducetheneedforchemicalpesticides.Andbestofallzpestresistantcropsdontharmbirdsatall.一、阅读听力要点概
11、括ReadingPassageMainpoints:Birdsnumberwilldeclineinresultofhumangrowth.Subpoint1:Birds1habitsdisappearsincehumanexpand.Subpoint2:Birdshabitatsdecreasesincefurtheragriculturalactivities.Subpoint3:Useofchemicalpesticideswillincreaseandkillagriculturalthenkillbirds.LectureAttitude:Unconvincing.SubPoint1
12、:Notauniformdeclineforallbirds.(BadforsomezGoodforsome,Seagulls,PigeonszHawks.)SubPoint2:Lesslandisusedforagriculture.(ProductiveCrops.)SubPoint3:Newpesticidesdontharmbirds.(Lesstoxic,Pestresistantcrops.)二、范文逐段赏析Paragraph1ThereadingpassageclaimsthatthenumberofbirdsintheUSwilldefinitelydecline.Yetthe
13、professorarguesthatbirdpopulationswillnotshrinkduetoincreasesinhumanpopulation,agriculture,andpesticideuseasissuggestedbythereadingpassagesauthor.此段功能：（Listeningpassage后文提到用L代替）（Readingpassage后文用R代替）以L的观点为主要观点。先复述R的观点：US的鸟群数量会降低。再确定L的反对逻辑关系。然后说鸟群数量不会随着人类增长而减少。此段结构：开头段非常简练干净，先复述R的观点，然后说L反对R,再列出L的观点。为
14、引出充分的辩论做出了准备。Paragraph2Firstztheprofessorpointsoutthaturbangrowth,whileharmfultosometypesofbirds,canprovidehabitatsformanyothertypes.Asamatteroffactzurbanandsuburbandwellerscomplainfrequentlyabouthavingtoomanybirds.This,however,contradictsthestatementinthereadingpassagethaturbandevelopmentcausesbird
15、stodisappear.此段功能：引出第一个分论点（人类引起的城市扩张对鸟类影响），L中说，虽然扩张影响了一部分鸟类，但是能为其他很多鸟类提供住所。甚至城市人会投诉鸟数量太多了，反对了R中的声明。此段结构：此段为总分结构,先写出L的结论,随后列举证据,最后达到反对R观点的效果。Paragraph3Second,theprofessorexplainsthatagriculturaldevelopmentwontaffectbirdpopulationasthereadingillustrates.Newly-introducedandhighlyproductivecropscontinuo
16、uslycontributetoproductionenhancementandmoreefficientlanduse,makingitunnecessaryforhumanstodestroymorewildernessareas.此段功能：引出第二个分论点，L中教授继续发表观点：农业发展不会影响鸟群数量。然后解释说新型高产作物使得人们不需要更多耕种用地。此段结构：此段还是总分结构。L发表了新观点后，列举证据，最后一句和R中所得结论相反。Paragraph4Thirdzwhileconvincedoftheharmfulnatureofpesticideusetobirds,theprofessordoesnotthinkitwillbeaprobleminthefuture,inthatpeopleareincreasinglyawareofthisproblemandaredevelopi
