【课件】Unit+5Using+Language课件人教版选择性必修第一册

Unit5WorkingthelandChemicalversusOrganicfarming[ˈvɜːsəs]prep.与…相对;与…对阵Whatcanbeusedtomakeplantsgrowbetter?Fertilizer.ChemicalfertilizersNaturalwastefromanimalsLead-inToprotectthecrops,farmershavetokillofftheharmfulpests.Q：Whatisusedforkilling

pests,especiallyinsects?A：Pesticides.OrganicFarmingOrganicfarmingissimplyfarmingwithoutusinganychemicals.Chemicalororganicfarming?Whichtomatoesdoyouprefer?5yuan/kg30yuan/kgNormaltomatoesOrganictomatoes1.Whatisthetextabout?ChemicalfarmingOrganicfarming

picturestitle2.Whattypeofwritingisit?A.Narration(记叙文)B.Exposition(说明文)C.Argumentation(议论文)

Pre-readingFastreadingMatchthemainideaswiththeparagraphsPara1-2Para3Para4Para5A.WhatorganicfarmingisB.Whyman-madechemicalsarestillusedinfarmingC.OrganicmethodsforproducingrichsoilD.TheproblemswithchemicaifarmingParagraphMainIdeaDetail1-2Pesticides can kill helpful

.Some pesticides have been

becauseofthe

.Crops grown with chemical fertilisers usually

tobefullof

.3Many organic farmers use

asfertiliser.DAbacteriaandinsectsprohibiteddamagetheycausegrowtoofastnutritionnaturalwastefromanimalsCarefulreadingParagraphMainIdeaDetail4They often

grownineachfield

.They also plant crops that use 

ofthesoiltohelpkeepitrich.5Organic farming is nowhere near able to meet the high

.CBchangethekindofcropeveryyeardifferentdepthsdemandforfoodaroundtheworldComprehending1.Whydidmanyfarmerswelcometheintroductionofchemicalfarming?A.Becauseitcostlessthantraditionalfarming.B.Becauseitcanfightcropdiseaseandincreaseproduction.C.Becauseitwasn’tharmfultopeople’shealthortheland.D.Becauseitcouldmakethesoilricherinminerals.B2.Thefollowingaretheproblemsofchemicalfarmingexcept

.A.Pesticidescankillhelpfulbacteriaandinsects.B.Longtermuseofitwillharmthelandandourhealth.C.Cropswillgrowfasterandlookmorebeautiful.D.Itwillcausedamagetotheenvironment.C3.Whydoorganicfarmerschangethekindofcropgrownineachfieldeveryfewyears?A.Ithelpsputimportantmineralsbackintotheground.B.Itcanavoiddamagetotheenvironment.C.Itcanhelpincreaseoutput.D.Thewriterdidn’ttellus.A4.Whycan’twestoptheuseofman-madechemicalsinagricultureentirely?A.Organicfarmingcostusalotofmoney.B.Organicfarmingcanmeetpeople’sneed.C.Chemicalfarmingbroughtushugeprofit.D.Chemicalfarminghelpsservetheneedforfood.D5.Whatistheauthor’spurposeofwritingthepassage?A.Tocallonfarmerstoturntoorganicfarming.B.Tointroducesomegoodwaystomakethesoilrich.C.Tourgethegovernmenttostopusingpesticides.D.Togivesomeadviceonhowtoincreasetheoutputofcrops.ASummary

Chemicalpesticidesandartificialfertilisershavebeeninwidespreaduseinfarming1.______themiddleofthe20thcentury,butscientistsfoundthattheirlong-termusecansometimesdoharmtoboththelandandpeople'shealth.Inmost2.__________(country),somepesticideslikeDDThavebeenprohibitedbecauseofthedamage3._______(cause)topeopleandtheenvironment.4.___________(solve)theproblem,

somefarmershaveswitchedtoorganicfarming.Theyusenaturalwastefromanimalsasfertiliserinsteadofartificialfertilisers.sincecountriescausedTosolveBy5._______(do)so,they

makethesoilintheirfields6._______(rich)inmineralsthanbefore.Manyothermethodsarealsousedtoproducerichsoil.Farmersoftenchange7.________kindofcropgrownineachfield

everyyear.Inthisway,someimportantminerals

8.________(put)backintotheground.

Somepeoplewouldprefertostoptheuseofman-madechemicalsinagriculture9.__________(complete),butorganicfarmingcan'tservethehighdemandforfoodaroundtheworld.Soscientistshavetofindasuitablesolution10.______theproblem.doingrichertheareputcompletelytoPara1

Chemicalpesticidesandartificialfertilisershavebeeninwidespreaduseinfarmingsincethemiddleofthe20thcentury.Whentheywerefirst

introduced,manyfarmerswelcomedthemasagreatwaytofightcropdiseaseandincreaseproduction.Overtime,however,whatsomescientistshavefoundisthattheirlong-termusecansometimesharmboththelandandpeoples’health.pesticiden.杀虫剂inwidespreaduse在广泛使用中introducev.推行；实施；采用overtime随着时间的流逝Para2

Forexample,pesticidescandamagethelandbykillingnotonlyharmfulbacteriaandinsects,butalsohelpfulones.Inaddition,thesechemicalscanstayinthesoilandundergroundwatersourcesforalongtime.Thisaffectsthecropsgrownonthelandand,inturn,theanimalsandhumanswhodigestthem.Manypeopleworrythatthesechemicalsmaymakethemillandevencausecancer.Infact,somepesticideslikeDDThavebeenprohibitedinmostcountriesbecauseofthedamagetheycausetopeopleandtheenvironment.Asforchemicalfertilisers,cropsgrownwiththemusuallygrowtoofasttoberichinnutrition.Theymaylookbeautifulontheoutside,butinsidethereisusuallymorewaterthanessentialminerals,andtheyoftenhavelessflavouraswell.bacterian(单数bacterium）细菌inturn相应地；转而；依次digestvtvi消化；vt领会；领悟asfor至于

too...to...太...而不能...essential:adj.完全必要的；极其重要的Para3

Asanalternative,somefarmershaveswitchedtoorganicfarming,andmanycustomershaveturnedtoorganicfoodwhentheyshopatthelocalgrocery.Organicfarmingissimplyfarmingwithoutusinganychemicals.Organicfarmersfocusonkeepingtheirsoilrichandfreeofdiseasethroughnaturalmeans.Forexample,manyorganicfarmersusenaturalwastefromanimalsasfertiliser.Thismakesthesoilintheirfieldsricherinminerals.Italsokeepstheair,soil,water,andcropsfreeofchemicals.alternativen.可供选择的事物switchto/turnto

转向，转变groceryn.

食品杂货店（pl食品杂货）keep...freeof/from

使...免受...伤害（或影响等）throughnaturalmeans通过天然的方法Para4

Organicfarmersalsousemanyothermethodstoproducerichsoil.Theyoftenchangethekindofcropgrownineachfieldeveryyear.Forinstance,theymaygrowcornorwheatinafieldoneyear,andthengrowbeanstherethenext.Whydifferentcropsaregrownisbecausetheyputimportantmineralsbackintotheground,makingitreadyforthenextbatchofcrops.Organicfarmersalsoplantdiversecropsthatuseddifferentdepthsofsoiltohelpkeepitrich.Forexample,peanutsgrowontheground’ssurface,butmanyothervegetablesputdowndeeproots.Thegoalofusingdifferentorganicfarmingmethodsistogrowgoodfoodwhileavoidingdamagetotheenvironmentortopeople’shealth.forinstance/forexample例如，比如depthn.向下（或向里）的距离；深度putdownroots生根；定居Para5

Somepeoplewouldprefertostoptheuseofman-madechemicalsinagricultureentirely.Whatkeepsthemfromdoingsoisthefactthatchemicalfarmingservesthehighdemandforfoodaroundtheworld.Organicfarmingisnowherenearabletomeetthatneed.Therefore,thereisstillalongwaytofindasuitablesolutionthatputssufficientfoodonthedinnertablewhilekeepingpeopleandtheenvironmentashealthyaspossible.entirelyadv.全部地；完整地；完全地servevt

对...有用，能满足...需要serve/meet/satisfythedemandfor满足对...需要

nowherenear远没有；远不及

Words&expressionsreview1.被广泛使用2.随着时间推移3.长期的使用4.反过来，相反地5.v.禁止6.v.富含...7.必需的矿物质beinwidespreaduseovertimelong-termuseinturnprohibitedberichinessentialminerals8.转向9.专注于10.例如11.满足对食物的高需求12.远非如此，远远不13.尽可能的健康switchtofocuson/bedevotedtoforinstance,servethehighdemandforfoodmeettheneed/satisfytheneedofnowherenear/Thisisfarfromthecase.ashealthyaspossibleWords&expressionsreviewUnit5WorkingthelandArgumentativewriting如何写优缺点型议论文OutlinePara.1Para.2YouropinionAdvantage2Para.3DisadvantageAdvantage1IntroductionBodyConclusionRestateyouropinionTitleDetailsDetailsDetails添加标题Writeyourownessay我们班关于有机农业和化学农业举行了一场辩论，请结合讨论的结果，写一篇支持有机农业的英语作文，内容包括：1.化学农业的危害2.有机农业的优点及理由3.做出总结注意：1.写作词数应为80左右

2.可以适当增加细节，以使行文连贯。DiscussionWhatadvantagesanddisadvantagesdoorganicandchemicalfarminghave?chemicalfarmingorganicfarmingadvantagesdisadvantagesfightcropdiseaseincreaseproductionlowercostcropslookbeautifuloutside......goodfoodavoidingdamagetotheenvironmentortopeople'shealth......harmthelandharmpeople’shealthharmtheenvironmentcropsarelessinnutrition......cannotmeetthedemandforfoodmoreeffortsandhighercostsmellygases......Learningforthelanguage1.最近我们讨论了要不要发展有机农业。看法因人而异。反方观点及理由2.很明显，使用化肥有很多缺点。Itisobviousthatusingchemicalfertilisers_________________________.3.最重要的是，留在作物内部的化学物质会导致癌症或其他疾病。Aboveall,thechemicalsstayinginsidethecrops_______________________________________________.4.这些蔬菜长得很快，几乎没有什么营养。Thevegetables________________________________________.Recently________________________________________organicagriculture.________________________________.weheldadiscussionaboutwhethertodevelopOpinionsvaryfrompersontopersonhasmanydisadvantagescanleadtocancerorotherillnessesgrowsofastthattheycontainlittlenutritionLearningforthelanguage正方观点及理由1.随着人们越来越富裕，他们非常重视健康。Aspeoplearebecomingricher,____________________________________.2.有机农产品只需使用天然肥料，使蔬菜和水果既美味又有营养。Organicproducesimplyusesnaturalfertilisers,____________________________andnutritive.3.这种产品生长在干净的水中，从不使用农药，这对我们的健康有益。Theproducegrowsincleanwaterandneverusespesticides,___________________________________________.健康是第一财富，所以选择有机食品更明智。theyattachgreatimportancetohealth.makingvegetablesandfruittastywhichisbeneficialtoourhealthHealthisthefirstwealth,soitiswisertochooseorganicfood.添加标题Writeyourownessay我们班关于有机农业和化学农业举行了一场辩论，请结合讨论的结果，写一篇支持有机农业的英语作文，内容包括：1.化学农业的危害2.有机农业的优点及理由3.做出总结注意：1.写作词数应为80左右

2.可以适当增加细节，以使行文连贯。HomeworkUsefulsentencepatternsExpressyouropinions:Inmyopinion,____farmingispreferableto_____farming.There