课件类：人教版高一英语下册19单元.ppt

Unit19ModernAgriculture,Period2Reading,Task1Pre-reading,LookatthepicturesonPage45andcomparetraditionalandmodernfarming.Whatcanyouseeinthepictures?2.Whataretheadvantagesanddisadvantagesofeachway?,Inthefirstpicture:,Achicken/Ahen.,Inthesecondpicture:,Afarmerfeedingchickens.,Inthethirdpicture:,Amodernchickenfarm.,Whatarethedifferences?Comparetheoldandthemodernwaysofraisingchickens.,Afarmercanonlykeepafewchickens.,Afactorycankeepthou-sandsofchickens.,Itcostonlyalittlemoney.,Itcostalottostartafactory.,donthavemanyproblems,ifill,manydieorarekilled,Theeggsandmeataretasty.,Theydonttastesodelicious.,Thechickensarefree.,notfree,cansitinsmallcages,Inthefirstpicture:,Apileofanimalshit(manure),Inthesecondpicture:,Abagofchemicalfertilizer.,Whatarethedifferences?Comparetheoldandthemodernwaysoffeedingthecrops.,Itisfreeorcostverylittle.,Itiseasytobeputintothefields.,Itusuallyhasabadsmell.,Ittakeslittleplacetostore.,Itisdifficulttocarryandmove.,Itisexpensivetobuy.,Itneedslotsofworktobemade.,Itusuallyhasnosmell.,Itneedsalotofplacetostore.,Itiseasytotransport.,Inthefirstpicture:,*Patchesoffarmfields.,Inthesecondpicture:,*Afarmerisploughingthefieldwithananimal.,Inthethirdpicture:,*Farmersusethetractortoworktheland.,Whatarethedifferences?Comparetheoldandthemodernwaysofploughingthefields.,cheaptoownandtokeep,expensivetobuyandtouse,Theyresultinpollution.,Theycanbeusedindif-ferentplaces,Theydontneedresttoooften.,Theycanbefoodwhentheyareold.,Theydonotpollutetheair.,Theycanonlybeusedonflatanddryland.,Theyneedrestnowandthen.,Theycanbesoldtosteelfactorieswhenbroken.,Terrace,Drought,Irrigatedland,Greenhouse,Inthefirstpicture:,*Terracedfields.,Inthesecondpicture:,*Drybarrenfarmland.,Inthethirdpicture:,*Irrigatedfarmland.,Inthefourthpicture:,*Greenhouses.,Whatarethedifferences?Comparetheoldandthemodernwaysofirrigation.,inbadweather,cropslost,climatecontrolled,lessdamage,Thelandscapelosesitsnaturalbeauty.,Onlyarablelandcangrowcrops.,Greenhousescanbebuiltalmosteverywhere.,Thelandscapeismorebeautiful.,Ifthereisapowerfailure,youmaylosecrops.,Task2ReadingScanning,*Dividethetextinto4partsandfindthemainideaofeachpart:,The1stpartthefirstparagraph,The2stpartthesecondparagraph,The3stpartthethirdparagraph,The4stpartthefourth,fifthandsixthparagraphs.,Paragraph1:,TraditionalagricultureinChina.,Paragraph2:,Thedevelopmentofagriculturebeforethe1980s.,Paragraph3:,Newtechniquestoprotectenvironmentaswellasincreasingproductionfromthe1990s.,Paragraph4:,Waystosolvetheproblemoftheshortageofarableland.,Whataretheways?,1.Growvegetablesingreenhouses.2.UseGMtocreateplantsthatproducemoreandbiggerandbettercrops.,TASK3ListentothetapeanddoExercise1Page46Post-reading,1.D2.A3.C4.C5.C,1.(para.1)Only7%ofthelandcanbeusedforfarming.,2.(para.2)Farmshaveusedfertilisationtomaketheirlandproducemore.,3.(para.3)Newtechniquesshouldincreasepro-ductionbutalsobefriendlytotheenvironment.,Giveyourreasonswithasentenceinthetext.,4.(para.4)Manyvegetablesarenotgrowningardensbutingreenhouseswheretheyarepro-tectedfromthewind,rainandinsects.,5.(para.5)Inotherwords,thewaytomatoesgrowfromanaturalseedischanged.,TASK4CarefulReadingTrueorFalse,1.Chinahasonlyabout67,000sq.kmofarableland.2.Noadvancedtechnicalinformationwasbroughtinfromabroadbefore1980.Scientistshavealwaystriedtoincreasefarmingproductionwithoutharmingtheenvironmentsincetheearly1990s.Traditionalmethodsoffarminghavenoadvantagessotheywontbeusedinfutureagriculture.TheaveragearablelandforeachChineseismuchlessthanthatoftheworld.,T,F,T,F,T,6.Growingvegetablesingreenhouseshassomanyadvantagesthatitcanreducelossescausedbybadweatherandthatitcanpartlysettletheproblemoftheshortageofarableland.7.GMisanewtechniquethatcanmakeaplantquitedifferentfromwhatitusedtobe,biggerandhealthierandwithnodiseases,butittakeslongertimetogrow.8.TheGMtechniquecanonlybeusedonplants,butnotonanimalsatthepresenttime.,T,F,F,TASK5Summaryofthetext,7%ofarablelandtofeed1.3billionpeople,AGRICULTURE,Traditionalagriculture,Modernagriculture,Futureagriculture,onefamilybusiness,chemicalfertilization,hightechnology,fertilization,irrigation,electricpump,and,traditionalmethods,notharmfultothe,environment,harmfultotheenvironment,takecareoftheenvironment,greenhouses,GMtechnique,therootshanginwatercontainingnutrients,protectedfromwind,rainandinsects,computercontrolsthetemperature,anaturalseedischanged,needmuchlesstime,withoutdangerfromdisease,fruitsarebiggerandhealthier,Questions:1.whatfarmingtechniqueshavebeenmodernized?,Chemicalfertilisers,Electricpumps,Twoormorecropsareplantedeachyear,Toimprovethesoil,Toirrigatethecrops,Toincreaseproduction,2.whatarethedisadvantagesofchemicalfertilisers?Theyareharmfultotheenvironment.3.Howwillyousolvethisproblem?,4.whatothertechniquescanhelptosolvethisproblem?GM5.WhatcanwechangethroughGM?Changefruits,vegetablesandevenanimalsThewaytheygrowWheretheycangrowHowtheywilltasteWhatcolourandwhatshapetheywillhave,6.SupposeyouareascientistofGM,howyouwouldchangethefollowingandwhy.,7.WhatisthebiggestproblemtoChinesefarmers?8.WhatdoesGMmean?,DiscussionExcepttheearth,whereelsecanwefindmoreland?,Ifyouwereoneofthescientist,whatwouldyoudotodevelopagricultureonMars?,ReadthetextandfindtheUsefulExpressions:,独户单干随着时间的推移利用引进国际交流对友善依靠保护免受与不同以而闻名换句话说代表做研究种种的，多种的,one-familybusinessovertimemakeuseofbringininternationalexchangebefriendlytodependonprotectfrombedifferentfrombeknownasinotherwordsstandfordoresearchavarietyof/varietiesof,3Practice(SBp47),Completethefollowingchart&chooseonewordtocompleteeachofthesentencesbelow.,1Afterafewteststhe_softwarecouldbeusedonallcomputers.2