Unit5WorkingtheLandUsinglanguageReadingforwriting课件高中英语人教版选择性2

XB1U5WorkingtheLandUsingLanguage2Evaluatechemicalfarmingandorganicfarming1.chemicalfarming化学耕作2.organicfarming有机耕作3.chemicalpesticide化学农药4.artificialfertiliser人工肥料5.widespreaduse广泛应用6.fightcropdisease抵御作物病害7.increaseproduction增加产量8.overtime随着时间的推移9.long-termuse长期使用10.harmboththelandandpeople’shealth危害土地和人类健康11.harmfulbacteriaandinsects有害细菌和昆虫12.inaddition=besides此外13.undergroundwatersources地下水源14.thecropsgrownontheland土里种植的作物15.inturn相应地，转而，依次，轮流16.byturns轮流17.taketurnstodosth轮流做某事18.Itisone’sturntodosth.轮到某人做某事19.Itturns/turnedoutthat…结果是20.makethemillandevencausecancer使他们生病甚至引发癌症21.asfor至于，关于22.growtoofasttoberichinnutrition生长过快而营养不足23.lookbeautifulontheoutsides外表靓丽24.Thereisusuallymorewaterthanessentialminerals.通常水分多于必需的矿物质25.havelessflavour口感较差26.asanalternative作为一种替代方法27.havenoalternative/choicebuttodo别无选择只好做某事28.analternativeto……的替代品29.switch/turnto转向30.shopatthelocalgrocery在当地食品杂货店购物31.Organicfarmingissimplyfarmingwithoutusinganychemicals.有机耕作就是不使用任何化学品的耕作。32.focuson/concentrateon集中注意力于33.keepsoilrichandfreeofdisease保持土壤肥沃，没有病害34.throughnaturalmeans通过天然的方式35.usenaturalwastefromanimalsasfertiliser使用天然的牲畜粪便作为肥料36.richinminerals富含矿物质37.keep…freeof使……免受……38.producerichsoil生产肥沃的土壤39.forinstance例如40.growcornorwheatinafield在田地里种植玉米或小麦41.putimportantmineralsbackintotheground把重要的矿物质重新放回土壤之中42.thenextbatchofcrops下一批作物43.diversecrops多样化作物44.usedifferentdepthsofsoil使用不同深度的土壤45.ontheground’ssurface在土壤表层46.putdowndeeproots扎根于土壤深处47.organicfarmingmethod有机耕作方法48.avoiddamagetotheenvironmentortopeople’shealth避免损害环境和人类健康49.man-madechemicals人工化学品50.servethehighdemandforfood满足对食物的高需求51.isnowherenearableto远远不能52.meettheneed满足需求53.thereisalongwayto………还有很长的路要走54.findasuitablesolution找到一个合适的解决方法55.putsufficientfoodonthedinnertable让人们有足够的食物可吃56.keeppeopleandtheenvironmentashealthyaspossible使人类和环境尽可能保持健康Inthisclass,youwill1.figureoutthedefinitionsandcharacteristicsofchemicalandorganicfarmingandthedifferencesbetweenthem.2.learnsomeusefulsignposts（transitionalwords）tomakeacomparisonbetweentwothings.3.writeanargumentativeessayaboutyouropiniononchemicalandorganicfarming.LearningObjectives1.Whatdoesthefarmerdointhefield?

Spraypesticides.2.Whydoeshedothat?

Tofightcropdiseaseandincreaseproduction.3.Whatelsemayfarmerdotomakecropsgrow?Usefertilisers.artificialfertilisersnaturalfertilisersActivity1:FreeTalkLeadinCHEMICALVERSUSORGANICFARMINGWhattypeofwritingisit?A.NarrationB.ExpositoryC.ArgumentationWhatmaybeincludedinthetext?

definition,benefit,problem,comparison...√PredictionReadingActivity2:ReadformainideaWhat'sthemainideaofthetext?

Thetextmainlytalksaboutchemicalfarmingandorganicfarming.________________cancausemanyproblems,asanalternative,somepeopleswitchto________________.ChemicalfarmingorganicfarmingActivity3:ReadforstructureMatchthemainideas(A-D)ofeachpart.Paragraph1&2A.WhatorganicfarmingisParagraph3B.Whyman-madechemicals

arestillusedinfarmingParagraph4C.Organicmethodsforproducing

richsoilParagraph5D.TheproblemswithchemicalfarmingWhatischemicalfarming?Chemicalpesticidesandartificialfertilisershavebeeninwidespreaduseinfarmingsincethemiddleofthe20thcentury.(Paragraph1)Whatisorganicfarming?Organicfarmingissimplyfarmingwithoutusinganychemicals.Organicfarmersfocusonkeepingtheirsoilrichandfreeofdiseasethroughnaturalmeans.(Paragraph3)Chemicalfarmingisfarmingusingpesticidesandartificialfertilisers.Activity4:ScanningReadandfindthedefinitionsofchemicalandorganicfarming.Activity5:ReadfordetailChemicalpesticidesandartificialfertilizershavebeenin

widespreaduseinfarmingsincethemiddleofthe20thcentury.Whentheywerefirstintroduced,manyfarmerswelcomedthemasagreatwaytofightcropdiseaseandincreaseproduction.Overtime,however,whatsomescientistshavefoundisthattheirlong-termusecansometimesharmboththelandandpeople’shealth.Forexample,pesticidescandamagethelandbykillingnotonlyharmfulbacteriaandinsects,butalsohelpfulones.Inaddition,thesechemicalscanstayinthesoilandundergroundwatersourcesforalongtime.Thisaffectsthecropsgrownonthelandand,inturn,theanimalsandhumanswhodigestthem.Infact,somepesticideslikeDDThavebeenprohibitedinmostcountriesbecauseofthedamagetheycausetopeopleandtheenvironment.Asforchemicalfertilizers,cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.Theymaylookbeautifulontheoutside,butinsidethereisusuallymorewaterthanessentialminerals,andtheyoftenhavelessflavoraswell.Readpart1(para1-2)andanswerthequestions.Q1:Whydidmanyfarmerswelcomechemicalfarming?Q2:Whatconcernsmanypeopleaboutthelonguseof

pesticides?Q3:Whatroledoesthesentenceinyellowplayinpart1?topicsentenceQ4:Whataretheproblems

withchemicalfarming?①②③Q5:Howdoestheauthororganizetheideas?Point1+detailsPoint2+detailsPoint3+detailsChemicalpesticidesandartificialfertilizershavebeenin

widespreaduseinfarmingsincethemiddleofthe20thcentury.Whentheywerefirstintroduced,manyfarmerswelcomedthemasagreatwaytofightcropdiseaseandincreaseproduction.Overtime,however,whatsomescientistshavefoundisthattheirlong-termusecansometimesharmboththelandandpeople’shealth.Forexample,pesticidescandamagethelandbykillingnotonlyharmfulbacteriaandinsects,butalsohelpfulones.Inaddition,thesechemicalscanstayinthesoilandundergroundwatersourcesforalongtime.Thisaffectsthecropsgrownonthelandand,inturn,theanimalsandhumanswhodigestthem.Infact,somepesticideslikeDDThavebeenprohibitedinmostcountriesbecauseofthedamagetheycausetopeopleandtheenvironment.Asforchemicalfertilizers,cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.Theymaylookbeautifulontheoutside,butinsidethereisusuallymorewaterthanessentialminerals,andtheyoftenhavelessflavoraswell.Readpart1(para1-2)andanswerthequestions.Q1:Whydidmanyfarmerswelcomechemicalfarming?Q2:Whatconcernsmanypeopleaboutthelonguseof

pesticides?Q3:Whatroledoesthesentenceinyellowplayinpart1?Q4:Whataretheproblems

withchemicalfarming?①②③Q6:Whatsignpostsareused?contrastexamplecauseandeffect,sequenceemphasiscontrastaddinformationintroducinganewtopic/thingReadpart2(para3)andanswerthequestions.Asanalternative,somefarmershaveswitchedtoorganicfarming,andmanycustomershaveturnedtoorganicfoodwhentheyshopatthelocalgrocery.Organicfarmingissimplyfarmingwithoutusinganychemicals.Organicfarmersfocusonkeepingtheirsoilrichandfreeofdiseasethroughnaturalmeans.Forexample,manyorganicfarmersusenaturalwastefromanimalsasfertilizer.Thismakesthesoilintheirfieldsricherinminerals.Italsokeepstheair,soil,waterandcropsfreeofchemicals.Q1:Whatisusedasorganicfertiliserfromtheparagraph?Q2:Whataretheadvantagesofusingorganicfertiliser?Q3:Whatsignpostsareused?

①②introducinganewideaexampleaddinformationReadpart3(para4)andanswerthequestions.Q1:Whatmethodsdidfarmersusetoproducerichoil?Q2:Whydidfarmersusedifferentorganicfarmingmethods?Q3:Howdoestheauthororganizetheideas?Whatsignpostsareused?

Organicfarmersalsousemanyothermethodstoproducerichsoil.Theyoftenchangethekindofcropgrownineachfieldeveryyear.Forinstance,theymaygrowcornorwheatinafieldoneyear,andthengrowbeanstherethenext.Whydifferentcropsaregrownisthattheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.Organicfarmersalsoplantdiversecropsthatusedifferentdepthsofsoiltohelpkeepitrich.Forexample,peanutsgrowontheground’ssurface,butmanyothervegetablesputdowndeeproots.Thegoalofusingdifferentorganicfarmingmethodsistogrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.Point1+detailsPoint2+detailsReadpart3(para4)andanswerthequestions.Q1:Whatothermethodsdidfarmersusetoproducerichoil?Q2:Whydidfarmersusedifferentorganicfarmingmethods?Q3:Howdoestheauthororganizetheideas?Whatsignpostsareused?

Organicfarmersalsousemanyothermethodstoproducerichsoil.Theyoftenchangethekindofcropgrownineachfieldeveryyear.Forinstance,theymaygrowcornorwheatinafieldoneyear,andthengrowbeanstherethenext.Whydifferentcropsaregrownisthattheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.Organicfarmersalsoplantdiversecropsthatusedifferentdepthsofsoiltohelpkeepitrich.Forexample,peanutsgrowontheground’ssurface,butmanyothervegetablesputdowndeeproots.Thegoalofusingdifferentorganicfarmingmethodsistogrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.addinformationexample/supportingapointReadpart4(para5)andanswerthequestions.Somepeoplewouldprefertostoptheuseofman-madechemicalsinagriculturalentirely.Whatkeepsthemfromdoingsoisthefactthatchemicalfarmingservesthehighdemandforfoodaroundtheworld.Organicfarmingisnowherenearabletomeetthatneed.Therefore,thereisstillalongwaytofindasuitablesolutionthatputssufficientfoodonthedinnertablewhilekeepingpeopleandtheenvironmentashealthyaspossible.Q1:Whatispeople’sattitudetowardschemicalandorganicfarming?Q2:Whydopeolehavesuchamixofattitude?Q3:Howdoestheauthororganizetheideas?Whatsignpostsareused?

conclusionForexample,...damagethelandbykillinghelpfulbacteriaandinsects.Inaddition,...affect...crops...theanimalsandhumans......growtoofasttoberichinnutrition...havelessflavouraswell.Forexample,...usenaturalwastefromanimalsasfertilisers....also...oftenchangethekindofcropgrownineachfieldeveryyear....alsoplantdiversecropsthatusedifferentdepthsofsoil...Post-readingActivity6:Discussion

FarmingAdvantagesDisadvantagesChemicalfarmingOrganicfarmingFightcropdiseaseIncrease

productionLowercostCropslookbeautifuloutsideHarmthelandHarmpeople’shealthHarmtheenvironmentCropsarelessinnutritionGoodfoodAvoidingdamagetotheenvironmentortopeople’shealthCannotmeetthedemandforfoodMoreeffortsandhighercostSmellygasesasmallercarbonfootprintreactimmediatelytoseverecropproblemsincrease

greenhousegasemissionsFunctionsSignpostsillustratinganideaaddingmoreinformationintroducinganewtopicgivingreasons/resultscontrastingsequencingforexample/forinstance/infactalso/inaddition/aswelltherefore/becausehowever/but/incontrastasfor/asanalternativeinturnWhatsignpostsareusedtomakeacomparisonbetweenchemicalandorganicfarming?Topicsentence:

Inmyopinion,_________farmingispreferableto_________farmingbecause_________________________________.Point1:__________________________________________________(Detail)____________________________________________Point2:__________________________________________________(Detail)____________________________________________Point3:__________________________________________________(Detail)____________________________________________Conclusion:

_______________________________________________Activity7Decidewhetheryousupportchemicalfarmingororganicfarming.Comeupwiththreemainpointstosupportyouropinion.Completetheoutlinebelow.Writingexpressyouropinions:Inmyeyes…Inmyopinion...I’mopposedto…I’dprefer…because…I’drather...Ithink/believe/guessthat...Frommypointofview,…WhatIfirmlybelieveinisthat…Myview/opinion/beliefisthat...Myimpressionisthat...Ihaveafeelingthat...I’mfullyconvincedthat...makeaconclusion:Insummary/conclusionInaword,…A