人教版高中英語必修四Unit2 Using Language Chemical or organic farming課件

人教課標高一必修4Unit2人教課標1UsingLanguageChemicalorOrganicFarmingWorkingthelandUsingLanguageWorkingtheland2Unit2CHEMICALORORGANICFARMING?化學耕作還是有機耕作？

Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.在過去的半個世紀里，在耕作中使用化肥已經(jīng)非常普遍。Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.很多農(nóng)民喜歡使用化肥。把化肥作為防治農(nóng)作物病蟲害和提高產(chǎn)量的重要手段。Recently,however,scientistshavebeenfindingthatlong-termuseofthesefertilizerscancausedamagetothelandand,evenmoredangerous,topeople'shealth.然而，最近科學家發(fā)現(xiàn)長期使用這些肥料會造成土地受損，甚至更危險的是，會對人們的健康造成危害。

Unit2CHEMICALORORGANICFARM3Whataresomeoftheproblemscausedbychemicalfertilizers?化肥帶來的問題有哪些呢？First,theydamagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones.首先，化肥在殺死病菌和害蟲的同時也會殺死有益的細菌和昆蟲，從而破壞土地。Chemicalsalsostayinthegroundandundergroundwaterforalongtime.化學物質(zhì)還會在地里和地下水中保存很長時間，Thisaffectscropsand,therefore,animalsandhumans,sincechemicalsgetinsidethecropsandcannotjustbewashedoff.而這會影響到莊稼，進而影響到動物和人類，因為化學成分會進入到農(nóng)作物中，并且不能被沖洗掉。Whataresomeoftheproblems4Thesechemicalsinthefoodsupplybuildupinpeople'sbodiesovertime.隨著時間的推移，食物中的這些化學成分會在人體中堆積。Manyofthesechemicalscanleadtocancerorotherillnesses.很多化學成分能導致癌癥或其他疾病。Inaddition,fruit,vegetablesandotherfoodgrownwithchemicalfertilizersusuallygrowtoofasttobefullofmuchnutrition.另外，施過化肥的水果、蔬菜和其他食物通常生長得過快而營養(yǎng)不足。Theymaylookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.它們表面上很好看，但里面通常是含過多的水分，而不是維生素和礦物質(zhì)。

Thesechemicalsinthefoodsu5Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.由于這些發(fā)現(xiàn)，一些農(nóng)民和消費者開始轉(zhuǎn)向有機耕作。Organicfarmingissimplyfarmingwithoutusinganychemicals.有機耕作就是不用任何化學肥料的耕作。Theyfocusonkeepingtheirsoilrichandfreeofdisease.農(nóng)民關心的是保持土壤肥沃并且免受病害。Ahealthysoilreducesdiseaseandhelpscropsgrowstrongandhealthy.健康的土壤會減少病蟲害并且?guī)椭r(nóng)作物茁壯成長。Withthesediscoveries,somef6Organicfarmers,therefore,oftenpreferusingnaturalwastefromanimalsasfertilizer.因此，有機耕作的農(nóng)民通常喜歡把天然的動物糞便當作肥料。Theyfeelthatthismakesthesoilintheirfieldsricherinmineralsandsomorefertile.他們認為這樣會使地里的土壤更富含礦物質(zhì)，因而也會更加肥沃，Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.同時還可以讓空氣、土壤、水以及農(nóng)作物不受化學物質(zhì)的污染。

Organicfarmers,therefore,of7

Organicfarmersalsousemanyothermethodstokeepthesoilfertile.有機耕作的農(nóng)民也使用很多其他的方法來保持土地肥沃。Theyoftenchangethekindofcropineachfieldeveryfewyears,forexample,growingcornorwheatandthenthenextyearpeasorsoybeans.在同一塊地里，他們經(jīng)常每隔幾年就換種農(nóng)作物。例如，種玉米和小麥后來年再改種豌豆或大豆。Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.像豌豆或大豆這樣的農(nóng)作物將重要的礦物質(zhì)帶回土壤，從而使之適宜于種植要求土地肥沃的農(nóng)作物，比如玉米或小麥。Organicfarmersalsousemany8Organicfarmersalsoplantcropstousedifferentlevelsofsoil,forexample,plantingpeanutsthatusetheground'ssurfacefollowedbyvegetablesthatputdowndeeproots.有機耕作的農(nóng)民還種植多種農(nóng)作物來利用不同層次的土壤。比如，他們先種植生長于淺層土壤的花生，然后再種植生根于深層土壤的蔬菜。Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear'scrop還有一些有機耕作者喜歡在農(nóng)作物之間種草，以防止水土流失，并且把草留在地里，從而成為來年農(nóng)作物的天然肥料。Organicfarmersalsoplantcro9Thesemanydifferentorganicfarmingmethodshavethesamegoal:togrowgoodfoodandavoiddamagingtheenvironmentorpeople'shealth.這些不同的有機耕作的方法有著同樣的目標：種植好的糧食，避免損害環(huán)境或者人們的健康。

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

Organicfarmingissimplyfarmingwithoutusinganychemicals.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)ORGANICFARMING人教版高14人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguage151.Whyarechemicalfertilizerssopopularinfarmingtoday?I.Readthepassageandanswerthefollowingquestions.Theyareagreatwaytostopcropdiseaseandincreaseproduction.Comprehending人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)1.Whyarechemicalfertilizer162.Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpestsandbystayinginthegroundandundergroundwaterforalongtime.Theydamagepeople’shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)2.Whatproblemscanbecaused173.Whatisorganicfarming?Organicfarmingmeansgrowingcropswithoutusinganychemicals.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)3.Whatisorganicfarming?184.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)4.Whatisthemainreasonfor19II.Readthetextagainandfillintheblanks.ChemicalFarmingAdvantagesStoppingcropdiseaseandincrease__________production人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)II.Readthetextagainandfi20ChemicalFarmingDisadvantagesDamagingtheland:killingthehelpful________________Damagingpeople’shealth:◆Manychemicalsinthefoodsupplycanleadtocancerorotherillnesses.◆Foodgrowstoofasttobefullofmuch________.bacteriaandpestsnutrition人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)ChemicalDisadvantagesDamaging21Organicfarming____Togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealthGoal人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)Organic____Togrowgoodfood22OrganicfarmingMethods◆Using_______wastefromanimalsasfertilizer◆Changing______________ineachfieldeveryfewyears◆Using_____________ofsoiltoplantcrops◆Planting_____betweencropsgrassnaturalthekindofcropdifferentlevels人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)OrganicMethods◆Using_______23Inwhatconditiondoyouthinkgreenfoodgrow?Theadvantagesofgreenfooddirtyairdirtywatersuppliesinindustrialareasmanychemicalfertilizersclean,freshaircleanwatersuppliesawayfromindustrialareasfreeofchemicalfertilizers人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)Inwhatconditiondoyouthink24MainideaofthepassageChemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)MainideaofthepassageChemic25ORGANICFARMINGStructureofthetextIusingchemicalfertilizersforalongtimecanhurtthelandandalsopeople’shealthIIProblemcausedbychemicalfertilizers人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)ORGANICFARMINGStructureofth261.Damagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones2.Leadtocancerorotherillness.3.Foodgrownwithchemicalfertilizerslookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)1.Damagethelandbykilling27ⅢOrganicfarmingisbecomingmorepopularwithsomefarmersandmanycustomersafterthesediscoveriescameout.IVOthermethodstokeepthesoilfertile.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)ⅢOrganicfarmingisbecoming28ProjectPersuadethefarmersinourcountytogrowthecropsbyorganicfarmingwiththeknowledgelearnt.Whatisorganicfarming?Whatfertilizershouldtheyuse?Why?Howtoplantthedifferentcrops?……人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)ProjectPersuadethefarmersin29Languagepoints1.leadto用法[寓詞于境]閱讀下列句子，注意leadto的意思和用法。1.Hiscarelessnessledtotheaccident.2.Thistestisobviouslybadbecauseitleads toincorrectlearning.3.Toomuchworkandtoolittlerestoften leadstoillness.[自我歸納]leadto意為“_________________”,后多跟名詞或代詞。導致、造成(后果)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)Languagepoints1.leadto用法導致、30[聯(lián)想]resultin引起(某種結(jié)果)、使獲得(某種成果)、結(jié)果……。如：Theaccidentresultedintwodeaths.resultfrom由……造成、因……而產(chǎn)生。如：Sicknesssometimesresultsfromeatingtoomuch.[即學即練]用leadto的適當形式完成句子。1.Studentsshouldalwaysrememberthathard workisthemainwaywhich______success.2.Thebadweather_____aterribleaccidenta fewdaysago.ledtoleadsto人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)[聯(lián)想]resultin引起(某種結(jié)果)、使獲得(某種成312.focus用法根據(jù)語境推斷focus在下列句子中的含義,并從a-d中找出與每句話中的focus相符合的英文釋義。人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)2.focus用法人教版高中英語必修四Unit2Usin321.Thefocusofthemeetingchangedfrompopulationgrowthtotheeducationofwomen.2.Bringtheobjectintofocusifyouwantaclearphotograph.3.Shetriedtofocushermindonherwork.4.SheturnedthecameraandfocusedonMartin’sface.a.thething,person,situation,etc.thatpeoplepayspecialattentiontob.apointordistanceatwhichtheoutlineofanobjectisclearlyseenbytheeyeorthroughalensc.topointacameraatsomething,andchangethecontrolsslightlysothatyoucanseethatthingclearlyd.togivespecialattentiontooneparticularpersonorthing,ortomakepeopledothisc

abd人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)1.Thefocusofthemeetingch33focus作名詞,意為“焦點、中心點”;作動詞,意為“集中、聚焦”,常構(gòu)成短語focuson,意為“集中(注意力、精力等)于”。翻譯下列句子。1.Becauseofhisstrangeclothes,he immediatelybecamethefocusof attentionwhenheenteredtheoffice.

由于他的奇裝異服,所以一走進辦公室他便成了大家注意的焦點。人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)focus作名詞,意為“焦點、中心點”;作動詞,意為“342.Focusyourcameraonthosetrees.3.I’msotiredthatIcan’tfocusonanythingtoday.把照相機的焦點集中在那些樹上。今天我太累了,精神集中不起來。人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)2.Focusyourcameraonthose353.keep…freefrom“遠離”或“避免”keepfreefromemotionalreactions

避免激動的反應

keepfreefromrestrictions

避免受到限制

人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)3.keep…freefrom“遠離”或“避免364.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)4.Cropssuchaspeasorsoybe37[分析]①本句結(jié)構(gòu)比較復雜。其主干結(jié)構(gòu)為:主句(Cropsputimportantmineralsbackintothesoil)+狀語(makingitreadyforcrops)。②狀語中又包含“make+it+形容詞”結(jié)構(gòu)和由that引導的定語從句(thatneedrichandfertilesoil)。人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)[分析]人教版高中英語必修四Unit2UsingLan385.Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear’scrop.[分析]①本句的主干結(jié)構(gòu)是一個簡單句,其結(jié)構(gòu)是:主語(farmers)+謂語(prefer)+并列賓語(planting...+leaving...)。人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)5.Someorganicfarmersprefer39②其中betweencrops和intheground作地點狀語。③兩個賓語后面又分別帶有一個不定式作目的狀語（topreventwindorwaterfromcarryingawaythesoil和tobecomeanaturalfertilizerforthenextyear’scrop）。人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)②其中betweencrops和intheground40Whatisthemaintopicoftheconversation?

Thepossiblebadeffectsofchemicalfertilizersonthefruitandvegetablesthatweeattoday.

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

TFTFT人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)PaulthinksthatCarrieisnot42Collectsomeinformationaboutthesafetyandimportanceofgreenfood.Homework人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)Collectsomeinformationabout43人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguageChemicalororganicfarming(1)(共44張PPT)人教版高中英語必修四Unit2UsingLanguage44人教課標高一必修4Unit2人教課標45UsingLanguageChemicalorOrganicFarmingWorkingthelandUsingLanguageWorkingtheland46Unit2CHEMICALORORGANICFARMING?化學耕作還是有機耕作？

Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.在過去的半個世紀里，在耕作中使用化肥已經(jīng)非常普遍。Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.很多農(nóng)民喜歡使用化肥。把化肥作為防治農(nóng)作物病蟲害和提高產(chǎn)量的重要手段。Recently,however,scientistshavebeenfindingthatlong-termuseofthesefertilizerscancausedamagetothelandand,evenmoredangerous,topeople'shealth.然而，最近科學家發(fā)現(xiàn)長期使用這些肥料會造成土地受損，甚至更危險的是，會對人們的健康造成危害。

Unit2CHEMICALORORGANICFARM47Whataresomeoftheproblemscausedbychemicalfertilizers?化肥帶來的問題有哪些呢？First,theydamagethelandbykillingthehelpfulbacteriaandpestsaswellastheharmfulones.首先，化肥在殺死病菌和害蟲的同時也會殺死有益的細菌和昆蟲，從而破壞土地。Chemicalsalsostayinthegroundandundergroundwaterforalongtime.化學物質(zhì)還會在地里和地下水中保存很長時間，Thisaffectscropsand,therefore,animalsandhumans,sincechemicalsgetinsidethecropsandcannotjustbewashedoff.而這會影響到莊稼，進而影響到動物和人類，因為化學成分會進入到農(nóng)作物中，并且不能被沖洗掉。Whataresomeoftheproblems48Thesechemicalsinthefoodsupplybuildupinpeople'sbodiesovertime.隨著時間的推移，食物中的這些化學成分會在人體中堆積。Manyofthesechemicalscanleadtocancerorotherillnesses.很多化學成分能導致癌癥或其他疾病。Inaddition,fruit,vegetablesandotherfoodgrownwithchemicalfertilizersusuallygrowtoofasttobefullofmuchnutrition.另外，施過化肥的水果、蔬菜和其他食物通常生長得過快而營養(yǎng)不足。Theymaylookbeautiful,butinsidethereisusuallymorewaterthanvitaminsandminerals.它們表面上很好看，但里面通常是含過多的水分，而不是維生素和礦物質(zhì)。

Thesechemicalsinthefoodsu49Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.由于這些發(fā)現(xiàn)，一些農(nóng)民和消費者開始轉(zhuǎn)向有機耕作。Organicfarmingissimplyfarmingwithoutusinganychemicals.有機耕作就是不用任何化學肥料的耕作。Theyfocusonkeepingtheirsoilrichandfreeofdisease.農(nóng)民關心的是保持土壤肥沃并且免受病害。Ahealthysoilreducesdiseaseandhelpscropsgrowstrongandhealthy.健康的土壤會減少病蟲害并且?guī)椭r(nóng)作物茁壯成長。Withthesediscoveries,somef50Organicfarmers,therefore,oftenpreferusingnaturalwastefromanimalsasfertilizer.因此，有機耕作的農(nóng)民通常喜歡把天然的動物糞便當作肥料。Theyfeelthatthismakesthesoilintheirfieldsricherinmineralsandsomorefertile.他們認為這樣會使地里的土壤更富含礦物質(zhì)，因而也會更加肥沃，Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.同時還可以讓空氣、土壤、水以及農(nóng)作物不受化學物質(zhì)的污染。

Organicfarmers,therefore,of51

Organicfarmersalsousemanyothermethodstokeepthesoilfertile.有機耕作的農(nóng)民也使用很多其他的方法來保持土地肥沃。Theyoftenchangethekindofcropineachfieldeveryfewyears,forexample,growingcornorwheatandthenthenextyearpeasorsoybeans.在同一塊地里，他們經(jīng)常每隔幾年就換種農(nóng)作物。例如，種玉米和小麥后來年再改種豌豆或大豆。Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.像豌豆或大豆這樣的農(nóng)作物將重要的礦物質(zhì)帶回土壤，從而使之適宜于種植要求土地肥沃的農(nóng)作物，比如玉米或小麥。Organicfarmersalsousemany52Organicfarmersalsoplantcropstousedifferentlevelsofsoil,forexample,plantingpeanutsthatusetheground'ssurfacefollowedbyvegetablesthatputdowndeeproots.有機耕作的農(nóng)民還種植多種農(nóng)作物來利用不同層次的土壤。比如，他們先種植生長于淺層土壤的花生，然后再種植生根于深層土壤的蔬菜。Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear'scrop還有一些有機耕作者喜歡在農(nóng)作物之間種草，以防止水土流失，并且把草留在地里，從而成為來年農(nóng)作物的天然肥料。Organicfarmersalsoplantcro53Thesemanydifferentorganicfarmingmethodshavethesamegoal:togrowgoodfoodandavoiddamagingtheenvironmentorpeople'shealth.這些不同的有機耕作的方法有著同樣的目標：種植好的糧食，避免損害環(huán)境或者人們的健康。

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

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