教學設計

課程基本信息學科英語年級高一學期秋季課題Unit5WorkingtheLandUsingLanguage教學目標（FourDimensionalKeypetencies）Knowledge&Skills:MasterkeyexpressionsaboutagriculturaltechnologyandYuanLongping’scontributions;learntoanalyzeargumentativestructureintexts.Process&Methods:Conductgroupdiscussionson"technologyvs.traditionalfarming"todevelopcriticalthinking;practicesummarizingmainideas.Affect&Values:Appreciatescientists’dedicationtofoodsecurity;fosterawarenessofsustainableagriculture.CulturalAwareness:UnderstandChina’sagriculturaldevelopmentanditsglobalinfluenceinfoodproduction.重難點（KeyandDifficultPoints）e.g.Graspingtechnicalterms(e.g.,hybridrice)andlinkingtextdetailstothemes;usingtopicrelatedvocabularyinspeaking.Difficult:Analyzinghowevidencesupportstheargumentaboutagriculturalinnovation;expressingpersonalviewslogicallyindebates.教學過程Teacher:Goodmorning,class!Today,wearegoingtocontinueourexplorationofUnit5WorkingtheLand,andfocusonUsingLanguagepart.Asweallknow,agricultureisthefoundationofourlife,anddifferentfarmingmethodshaveahugeimpactonourfood,environmentandhealth.So,areyoureadytodivedeeperintotheworldoffarming?Students:Yes!Teacher:Great!First,let'stakeaquicklookatthetitleofourtexttodayChemicalVersusOrganicFarming.Whatcanyouguessfromthistitle?Anyideas?Tom,please.Tom:Ithinkitwilltalkaboutthedifferencesbetweenchemicalfarmingandorganicfarming.Teacher:Exactly!Yougotthepoint.Thistextwillintroducethetwomainfarmingmethodsandparetheiradvantagesanddisadvantages.Now,let'sstartreadingthetexttogether.Teacher:Thefirstparagraphsays“Chemicalpesticidesandartificialfertilisershavebeeninwidespreaduseinfarmingsincethemiddleofthe20thcentury.”Whocantellmethekeywordsinthissentence?Lily?Lily:Chemicalpesticides,artificialfertilisers,widespreaduse,20thcentury.Teacher:Verygood.Now,doyouknowwhat“pesticide”means?Itisachemicalsubstanceusedtokillpests.And“fertiliser”isasubstanceaddedtosoiltohelpplantsgrow.So,whyhavechemicalpesticidesandartificialfertilisersbeeninwidespreadusesincethemiddleofthe20thcentury?Let'sreadthenextsentence.“Whentheywerefirstintroduced,manyfarmersweledthemasagreatwaytofightcropdiseaseandincreaseproduction.”Here,whocanexplainthephrase“agreatwaytodosth”?Jack:Itmeansagoodmethodtodosomething.Teacher:Right.So,atfirst,chemicalpesticidesandartificialfertilisersseemedtobeawonderfulsolutionforfarmerstoprotecttheircropsandgetmoreharvest.Butisitreallyallgood?Let'scontinue.“Overtime,however,whatsomescientistshavefoundisthattheirlongtermusecansometimesharmboththelandandpeoples’health.”Lookatthissentence,it'sabitplex.Thereisasubjectclause“whatsomescientistshavefound”andapredicativeclause“thattheirlongtermusecansometimesharmboththelandandpeoples’health”.Canyouunderstandit?Let'sbreakitdown.Whatdoesthesubjectclausemean?Emma:Itmeansthethingsthatscientistshavediscovered.Teacher:Perfect.Andwhataboutthepredicativeclause?Sam:Itmeansthatusingchemicalpesticidesandartificialfertilisersforalongtimemaybebadforthelandandpeople'shealth.Teacher:Exactly.Now,let'sseesomeexamples.“Forexample,pesticidescandamagethelandbykillingnotonlyharmfulbacteriaandinsects,butalsohelpfulones.”Canyoutellmesomeharmfulbacteriaorinsectsthatyouknow?Students:(variousanswerslikeaphids,caterpillars,etc.)Teacher:Good.Andpesticides,whilekillingthebadones,alsokillthegoodbacteriaandinsectsthatarebeneficialtotheland.Then,“Inaddition,thesechemicalscanstayinthesoilandundergroundwatersourcesforalongtime.Thisaffectsthecropsgrownonthelandand,inturn,theanimalsandhumanswhodigestthem.”Here,“inturn”meansoneafteranother.So,thechemicalsinthesoilandwaterfirstaffectthecrops,andthenaffecttheanimalsandhumanswhoeatthesecrops.Whatdoyouthinkofthissituation?Students:It'sworrying.Teacher:Yes,itis.Manypeopleworrythatthesechemicalsmaymakethemillandevencausecancer.Infact,somepesticideslikeDDThavebeenprohibitedinmostcountriesbecauseofthedamagetheycausetopeopleandtheenvironment.Now,let'smoveontochemicalfertilisers.“Asforchemicalfertilisers,cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.”Whatdoesthissentenceimply?Lucy:Itmeansthatalthoughthecropsgrowfastwithchemicalfertilisers,theymaynotbeverynutritious.Teacher:Right.“Theymaylookbeautifulontheoutside,butinsidethereisusuallymorewaterthanessentialminerals,andtheyoftenhavelessflavouraswell.”So,wecanseethatchemicalfarming,despiteitsinitialadvantages,hassomeseriousdrawbacks.Teacher:Now,asanalternative,whatdosomefarmersdo?Readthenextpart.Students:Somefarmershaveswitchedtoorganicfarming,andmanycustomershaveturnedtoorganicfoodwhentheyshopatthelocalgrocery.Teacher:Good.So,whatisorganicfarming?“Organicfarmingissimplyfarmingwithoutusinganychemicals.”It'squitedifferentfromchemicalfarming.Then,howdoorganicfarmerskeeptheirsoilrichandfreeofdisease?Students:Throughnaturalmeans.Teacher:Exactly.“Forexample,manyorganicfarmersusenaturalwastefromanimalsasfertiliser.Thismakesthesoilintheirfieldsricherinminerals.Italsokeepstheair,soil,water,andcropsfreeofchemicals.”So,usingnaturalwasteasfertiliserisagreatnaturalway.Canyouthinkofanyothernaturalmeansthatorganicfarmersmayuse?Students:(suggestionslikecroprotation,usingpost,etc.)Teacher:Verygood.Organicfarmersalsousemanyothermethodstoproducerichsoil.“Theyoftenchangethekindofcropgrownineachfieldeveryyear.”Whydotheydothis?Mike:Maybedifferentcropsneeddifferentnutrients,sochangingcropscankeepthesoilbalanced.Teacher:Youareverysmart.“Forinstance,theymaygrowcornorwheatinafieldoneyear,andthengrowbeanstherethenext.”And“Whydifferentcropsaregrownisthattheyputimportantmineralsbackintotheground,makingitreadyagainforthenextbatchofcrops.”Here,theclause“Whydifferentcropsaregrown”isthesubjectclause,and“thattheyputimportantmineralsbackintotheground”isthepredicativeclause.Organicfarmersalsoplantdiversecropsthatusedifferentdepthsofsoiltohelpkeepitrich.Canyougivesomeexamplesofcropswithdifferentrootdepths?Students:(answerslikecarrotswithdeeprootsandlettucewithshallowroots)Teacher:Great.Thegoalofusingdifferentorganicfarmingmethodsistogrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.Butwhydon'tallfarmersswitchtoorganicfarming?Students:Maybeit'smoreexpensiveortheyieldislower.Teacher:Youarethinkingintherightdirection.Thetextalsomentionsthat“Whatkeepsthemfromdoingsoisthefactthatchemicalfarmingservesthehighdemandforfoodaroundtheworld.”So,therearestillsomechallengesfororganicfarmingtoreplacechemicalfarmingpletely.Teacher:Now,let'sreviewsomeimportantwordsandphrasesinthistext.“Pesticide”isachemicalforkillingpests,and“fertiliser”isforhelpingplantsgrow.“Beinwidespreaduse”meansbeingusedbymanypeopleorinmanyplaces.“Harm”canbeaverboranoun,meaningtocausedamageorinjury.“Inturn”meansoneafteranotherorasaresult.“Alternative”meansanotherchoice.“Switchto”meanstochangetosomethingelse.Canyouusethesewordsandphrasestomakesentences?Let'sstartwith“pesticide”.David,please.David:Pesticidesarewidelyusedintraditionalfarmingtoprotectcropsfrompests.Teacher:Good.Now,“fertiliser”.Sally:Farmersaddfertilisertothesoiltomaketheplantsgrowbetter.Teacher:Verygood.Let'scontinuewiththeothers.Teacher:Afterlearningthetext,let'sdosomegrammarexercisesrelatedtowhatwehavelearned.Wehaveseenmanyexamplesofsubjectclauses,predicativeclausesandpastparticiplesusedas后置定語inthetext.Forexample,“whatsomescientistshavefound”isasubjectclause,“thattheirlongtermusecansometimesharmboththelandandpeoples’health”isapredicativeclause,and“cropsgrownwiththem”where“grown”isapastparticipleusedas后置定語.Now,hereisasentence:“Thebookwrittenbythisfamousauthorisverypopular.”Canyoutellmewhi