人教版高中英语必修四Unit2 Using Language Chemical or organic farming课件

人教课标高一必修4Unit2人教课标1UsingLanguageChemicalorOrganicFarmingWorkingthelandUsingLanguageWorkingtheland2Unit2CHEMICALORORGANICFARMING?化学耕作还是有机耕作？

Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.在过去的半个世纪里，在耕作中使用化肥已经非常普遍。Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.很多农民喜欢使用化肥。把化肥作为防治农作物病虫害和提高产量的重要手段。Recently,however,scientistshavebeenfindingthatlong-termuseofthesefertilizerscancausedamagetothelandand,evenmoredangerous,topeople'shealth.然而，最近科学家发现长期使用这些肥料会造成土地受损，甚至更危险的是，会对人们的健康造成危害。

Unit2CHEMICALORORGANICFARM3Whataresomeoftheproblemscausedbychemicalfertilizers?化肥带来的问题有哪些呢？First,theydamagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones.首先，化肥在杀死病菌和害虫的同时也会杀死有益的细菌和昆虫，从而破坏土地。Chemicalsalsostayinthegroundandundergroundwaterforalongtime.化学物质还会在地里和地下水中保存很长时间，Thisaffectscropsand,therefore,animalsandhumans,sincechemicalsgetinsidethecropsandcannotjustbewashedoff.而这会影响到庄稼，进而影响到动物和人类，因为化学成分会进入到农作物中，并且不能被冲洗掉。Whataresomeoftheproblems4Thesechemicalsinthefoodsupplybuildupinpeople'sbodiesovertime.随着时间的推移，食物中的这些化学成分会在人体中堆积。Manyofthesechemicalscanleadtocancerorotherillnesses.很多化学成分能导致癌症或其他疾病。Inaddition,fruit,vegetablesandotherfoodgrownwithchemicalfertilizersusuallygrowtoofasttobefullofmuchnutrition.另外，施过化肥的水果、蔬菜和其他食物通常生长得过快而营养不足。Theymaylookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.它们表面上很好看，但里面通常是含过多的水分，而不是维生素和矿物质。

Thesechemicalsinthefoodsu5Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.由于这些发现，一些农民和消费者开始转向有机耕作。Organicfarmingissimplyfarmingwithoutusinganychemicals.有机耕作就是不用任何化学肥料的耕作。Theyfocusonkeepingtheirsoilrichandfreeofdisease.农民关心的是保持土壤肥沃并且免受病害。Ahealthysoilreducesdiseaseandhelpscropsgrowstrongandhealthy.健康的土壤会减少病虫害并且帮助农作物茁壮成长。Withthesediscoveries,somef6Organicfarmers,therefore,oftenpreferusingnaturalwastefromanimalsasfertilizer.因此，有机耕作的农民通常喜欢把天然的动物粪便当作肥料。Theyfeelthatthismakesthesoilintheirfieldsricherinmineralsandsomorefertile.他们认为这样会使地里的土壤更富含矿物质，因而也会更加肥沃，Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.同时还可以让空气、土壤、水以及农作物不受化学物质的污染。

Organicfarmers,therefore,of7

Organicfarmersalsousemanyothermethodstokeepthesoilfertile.有机耕作的农民也使用很多其他的方法来保持土地肥沃。Theyoftenchangethekindofcropineachfieldeveryfewyears,forexample,growingcornorwheatandthenthenextyearpeasorsoybeans.在同一块地里，他们经常每隔几年就换种农作物。例如，种玉米和小麦后来年再改种豌豆或大豆。Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于种植要求土地肥沃的农作物，比如玉米或小麦。Organicfarmersalsousemany8Organicfarmersalsoplantcropstousedifferentlevelsofsoil,forexample,plantingpeanutsthatusetheground'ssurfacefollowedbyvegetablesthatputdowndeeproots.有机耕作的农民还种植多种农作物来利用不同层次的土壤。比如，他们先种植生长于浅层土壤的花生，然后再种植生根于深层土壤的蔬菜。Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear'scrop还有一些有机耕作者喜欢在农作物之间种草，以防止水土流失，并且把草留在地里，从而成为来年农作物的天然肥料。Organicfarmersalsoplantcro9Thesemanydifferentorganicfarmingmethodshavethesamegoal:togrowgoodfoodandavoiddamagingtheenvironmentorpeople'shealth.这些不同的有机耕作的方法有着同样的目标：种植好的粮食，避免损害环境或者人们的健康。

人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Thesemanydifferentorganicf10Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Whatisthesubstancewep11Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Howmanykindsoffertilizers12Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknowaboutorganicfarming?人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Whichkinddofarmersusew13ORGANICFARMING

Organicfarmingissimplyfarmingwithoutusinganychemicals.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ORGANICFARMING人教版高14人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguage151.Whyarechemicalfertilizerssopopularinfarmingtoday?I.Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.Comprehending人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)1.Whyarechemicalfertilizer162.Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtime.Theydamagepeople’shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)2.Whatproblemscanbecaused173.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutusinganychemicals.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)3.Whatisorganicfarming?184.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)4.Whatisthemainreasonfor19II.Readthetextagainandfillintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________production人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)II.Readthetextagainandfi20ChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrowstoofasttobefullofmuch________.bacteriaandpestsnutrition人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ChemicalDisadvantagesDamaging21Organicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoal人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Organic____Togrowgoodfood22OrganicfarmingMethods◆Using_______wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewyears◆Using_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevels人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)OrganicMethods◆Using_______23Inwhatconditiondoyouthinkgreenfoodgrow?Theadvantagesofgreenfooddirtyairdirtywatersuppliesinindustrialareasmanychemicalfertilizersclean,freshaircleanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizers人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Inwhatconditiondoyouthink24MainideaofthepassageChemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)MainideaofthepassageChemic25ORGANICFARMINGStructureofthetextIusingchemicalfertilizersforalongtimecanhurtthelandandalsopeople’shealthIIProblemcausedbychemicalfertilizers人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ORGANICFARMINGStructureofth261.Damagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones2.Leadtocancerorotherillness.3.Foodgrownwithchemicalfertilizerslookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)1.Damagethelandbykilling27ⅢOrganicfarmingisbecomingmorepopularwithsomefarmersandmanycustomersafterthesediscoveriescameout.IVOthermethodstokeepthesoilfertile.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ⅢOrganicfarmingisbecoming28ProjectPersuadethefarmersinourcountytogrowthecropsbyorganicfarmingwiththeknowledgelearnt.Whatisorganicfarming?Whatfertilizershouldtheyuse?Why?Howtoplantthedifferentcrops?……人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ProjectPersuadethefarmersin29Languagepoints1.leadto用法[寓词于境]阅读下列句子，注意leadto的意思和用法。1.Hiscarelessnessledtotheaccident.2.Thistestisobviouslybadbecauseitleads toincorrectlearning.3.Toomuchworkandtoolittlerestoften leadstoillness.[自我归纳]leadto意为“_________________”,后多跟名词或代词。导致、造成(后果)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Languagepoints1.leadto用法导致、30[联想]resultin引起(某种结果)、使获得(某种成果)、结果……。如：Theaccidentresultedintwodeaths.resultfrom由……造成、因……而产生。如：Sicknesssometimesresultsfromeatingtoomuch.[即学即练]用leadto的适当形式完成句子。1.Studentsshouldalwaysrememberthathard workisthemainwaywhich______success.2.Thebadweather_____aterribleaccidenta fewdaysago.ledtoleadsto人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)[联想]resultin引起(某种结果)、使获得(某种成312.focus用法根据语境推断focus在下列句子中的含义,并从a-d中找出与每句话中的focus相符合的英文释义。人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)2.focus用法人教版高中英语必修四Unit2Usin321.Thefocusofthemeetingchangedfrompopulationgrowthtotheeducationofwomen.2.Bringtheobjectintofocusifyouwantaclearphotograph.3.Shetriedtofocushermindonherwork.4.SheturnedthecameraandfocusedonMartin’sface.a.thething,person,situation,etc.thatpeoplepayspecialattentiontob.apointordistanceatwhichtheoutlineofanobjectisclearlyseenbytheeyeorthroughalensc.topointacameraatsomething,andchangethecontrolsslightlysothatyoucanseethatthingclearlyd.togivespecialattentiontooneparticularpersonorthing,ortomakepeopledothisc

abd人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)1.Thefocusofthemeetingch33focus作名词,意为“焦点、中心点”;作动词,意为“集中、聚焦”,常构成短语focuson,意为“集中(注意力、精力等)于”。翻译下列句子。1.Becauseofhisstrangeclothes,he immediatelybecamethefocusof attentionwhenheenteredtheoffice.

由于他的奇装异服,所以一走进办公室他便成了大家注意的焦点。人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)focus作名词,意为“焦点、中心点”;作动词,意为“342.Focusyourcameraonthosetrees.3.I’msotiredthatIcan’tfocusonanythingtoday.把照相机的焦点集中在那些树上。今天我太累了,精神集中不起来。人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)2.Focusyourcameraonthose353.keep…freefrom“远离”或“避免”keepfreefromemotionalreactions

避免激动的反应

keepfreefromrestrictions

避免受到限制

人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)3.keep…freefrom“远离”或“避免364.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)4.Cropssuchaspeasorsoybe37[分析]①本句结构比较复杂。其主干结构为:主句(Cropsputimportantmineralsbackintothesoil)+状语(makingitreadyforcrops)。②状语中又包含“make+it+形容词”结构和由that引导的定语从句(thatneedrichandfertilesoil)。人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)[分析]人教版高中英语必修四Unit2UsingLan385.Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear’scrop.[分析]①本句的主干结构是一个简单句,其结构是:主语(farmers)+谓语(prefer)+并列宾语(planting...+leaving...)。人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)5.Someorganicfarmersprefer39②其中betweencrops和intheground作地点状语。③两个宾语后面又分别带有一个不定式作目的状语（topreventwindorwaterfromcarryingawaythesoil和tobecomeanaturalfertilizerforthenextyear’scrop）。人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)②其中betweencrops和intheground40Whatisthemaintopicoftheconversation?

Thepossiblebadeffectsofchemicalfertilizersonthefruitandvegetablesthatweeattoday.

Listening人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Whatisthemaintopico41PaulthinksthatCarrieisnottellinghimthetruth.Usingchemicalfertilizersalwaysmakesvegetablesemptyinside.Today’sfruitisnotashealthyforpeopleasfruitfiftyyearsago.Eatingmorevegetablesmightnotalwaysbegoodforus.Alloftoday’svegetableslookhealthybutinfactarenot.TorF.

TFTFT人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)PaulthinksthatCarrieisnot42Collectsomeinformationaboutthesafetyandimportanceofgreenfood.Homework人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Collectsomeinformationabout43人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguage44人教课标高一必修4Unit2人教课标45UsingLanguageChemicalorOrganicFarmingWorkingthelandUsingLanguageWorkingtheland46Unit2CHEMICALORORGANICFARMING?化学耕作还是有机耕作？

Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.在过去的半个世纪里，在耕作中使用化肥已经非常普遍。Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.很多农民喜欢使用化肥。把化肥作为防治农作物病虫害和提高产量的重要手段。Recently,however,scientistshavebeenfindingthatlong-termuseofthesefertilizerscancausedamagetothelandand,evenmoredangerous,topeople'shealth.然而，最近科学家发现长期使用这些肥料会造成土地受损，甚至更危险的是，会对人们的健康造成危害。

Unit2CHEMICALORORGANICFARM47Whataresomeoftheproblemscausedbychemicalfertilizers?化肥带来的问题有哪些呢？First,theydamagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones.首先，化肥在杀死病菌和害虫的同时也会杀死有益的细菌和昆虫，从而破坏土地。Chemicalsalsostayinthegroundandundergroundwaterforalongtime.化学物质还会在地里和地下水中保存很长时间，Thisaffectscropsand,therefore,animalsandhumans,sincechemicalsgetinsidethecropsandcannotjustbewashedoff.而这会影响到庄稼，进而影响到动物和人类，因为化学成分会进入到农作物中，并且不能被冲洗掉。Whataresomeoftheproblems48Thesechemicalsinthefoodsupplybuildupinpeople'sbodiesovertime.随着时间的推移，食物中的这些化学成分会在人体中堆积。Manyofthesechemicalscanleadtocancerorotherillnesses.很多化学成分能导致癌症或其他疾病。Inaddition,fruit,vegetablesandotherfoodgrownwithchemicalfertilizersusuallygrowtoofasttobefullofmuchnutrition.另外，施过化肥的水果、蔬菜和其他食物通常生长得过快而营养不足。Theymaylookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.它们表面上很好看，但里面通常是含过多的水分，而不是维生素和矿物质。

Thesechemicalsinthefoodsu49Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.由于这些发现，一些农民和消费者开始转向有机耕作。Organicfarmingissimplyfarmingwithoutusinganychemicals.有机耕作就是不用任何化学肥料的耕作。Theyfocusonkeepingtheirsoilrichandfreeofdisease.农民关心的是保持土壤肥沃并且免受病害。Ahealthysoilreducesdiseaseandhelpscropsgrowstrongandhealthy.健康的土壤会减少病虫害并且帮助农作物茁壮成长。Withthesediscoveries,somef50Organicfarmers,therefore,oftenpreferusingnaturalwastefromanimalsasfertilizer.因此，有机耕作的农民通常喜欢把天然的动物粪便当作肥料。Theyfeelthatthismakesthesoilintheirfieldsricherinmineralsandsomorefertile.他们认为这样会使地里的土壤更富含矿物质，因而也会更加肥沃，Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.同时还可以让空气、土壤、水以及农作物不受化学物质的污染。

Organicfarmers,therefore,of51

Organicfarmersalsousemanyothermethodstokeepthesoilfertile.有机耕作的农民也使用很多其他的方法来保持土地肥沃。Theyoftenchangethekindofcropineachfieldeveryfewyears,forexample,growingcornorwheatandthenthenextyearpeasorsoybeans.在同一块地里，他们经常每隔几年就换种农作物。例如，种玉米和小麦后来年再改种豌豆或大豆。Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于种植要求土地肥沃的农作物，比如玉米或小麦。Organicfarmersalsousemany52Organicfarmersalsoplantcropstousedifferentlevelsofsoil,forexample,plantingpeanutsthatusetheground'ssurfacefollowedbyvegetablesthatputdowndeeproots.有机耕作的农民还种植多种农作物来利用不同层次的土壤。比如，他们先种植生长于浅层土壤的花生，然后再种植生根于深层土壤的蔬菜。Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear'scrop还有一些有机耕作者喜欢在农作物之间种草，以防止水土流失，并且把草留在地里，从而成为来年农作物的天然肥料。Organicfarmersalsoplantcro53Thesemanydifferentorganicfarmingmethodshavethesamegoal:togrowgoodfoodandavoiddamagingtheenvironmentorpeople'shealth.这些不同的有机耕作的方法有着同样的目标：种植好的粮食，避免损害环境或者人们的健康。

人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Thesemanydifferentorganicf54Whatisthesubstanceweputonthesoilwhichmakescropsgrow?Itisfertilizer.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Whatisthesubstancewep55Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Howmanykindsoffertilizers56Whichkinddofarmersusewhentheyaredoingorganicfarming?Doyouknowaboutorganicfarming?人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Whichkinddofarmersusew57ORGANICFARMING

Organicfarmingissimplyfarmingwithoutusinganychemicals.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ORGANICFARMING人教版高58人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguage591.Whyarechemicalfertilizerssopopularinfarmingtoday?I.Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.Comprehending人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)1.Whyarechemicalfertilizer602.Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtime.Theydamagepeople’shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)2.Whatproblemscanbecaused613.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutusinganychemicals.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)3.Whatisorganicfarming?624.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)4.Whatisthemainreasonfor63II.Readthetextagainandfillintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________production人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)II.Readthetextagainandfi64ChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrowstoofasttobefullofmuch________.bacteriaandpestsnutrition人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ChemicalDisadvantagesDamaging65Organicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoal人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Organic____Togrowgoodfood66OrganicfarmingMethods◆Using_______wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewyears◆Using_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevels人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)OrganicMethods◆Using_______67Inwhatconditiondoyouthinkgreenfoodgrow?Theadvantagesofgreenfooddirtyairdirtywatersuppliesinindustrialareasmanychemicalfertilizersclean,freshaircleanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizers人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)Inwhatconditiondoyouthink68MainideaofthepassageChemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)MainideaofthepassageChemic69ORGANICFARMINGStructureofthetextIusingchemicalfertilizersforalongtimecanhurtthelandandalsopeople’shealthIIProblemcausedbychemicalfertilizers人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)ORGANICFARMINGStructureofth701.Damagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones2.Leadtocancerorotherillness.3.Foodgrownwithchemicalfertilizerslookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)人教版高中英语必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44张PPT)1.Damagethelan