人教版高中英语 必修四Unit2阅读精品课件

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Unit2WorkingthelandUsinglanguageHaveadictationItisfertilizer.Whatisthesubstance物质weputonthesoiltomakecropsgrow?OrganicFarmingTomatoRiceSpongecucumber丝瓜Pumpkin南瓜chemicalfertilizercowdung用化学肥料和有机肥料的区别:Seeingisbelieving!Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.ReadingCHEMICALORORGANICFARMING?Long-termuseofchemicalfertilizerscancausedamagetothelandandpeople’shealth.Problemscausedbychemicalfertilizers.ThemainideaofeachparagraphP1.P2.Farmersandcustomersturntoorganicfarming.Othermethodstokeepthesoilfertile.P3.P4.Chemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.Organicfarmingmeansgrowingcropswithnaturalfertilizer.Theorganicfarmerskeepthesoilrichandhealthy.Themainideaofthetext:ListeningKillbothhelpfulandharmfulbacteriaandpestsNotgoodforthesoilorthewatersupplyAffectcrops,animals,andhumans.ChemicalfertilizerGrowtoofasttobefullofnutritionChemicalfarmingadvantagesproblemscausestopcropdiseaseincreaseproductiondamagethelandbykilling…affectcropsbystaying…leadtocancer/illnessesbybuildingup…havelessnutritionbygrowingtoofastReadingIwillcallonestudenttoreadparagraph3,then,pleasereadthelastparttogether.Also,weshouldfinishthefollowingtask.OrganicfarmingNaturalwastefromanimalsMakethesoilricherinmineralsandmorefertileAhealthysoilReducediseasesincropsHelpcropsgrowstrongandhealthyOrganicfarmingmethodsadvantagesusenaturalwastemakethesoilrichinmineralschangethecropputmineralsbackintosoil,making…plantcropswithdifferentrootsusedifferentlevelsoflandplantgrassbetweencropsprevent…from…,anaturalfertilizer1.Whatistheadvantageofusingchemicalfertilizers?A.Leavingchemicalsinthegroundforalongtimeisgoodforwatersupply.B.Theycangetthesoilexhausted.C.Theycankillhelpfulbacteria.D.Theycankillharmfulpest.DChoosethebestanswer.2.Whichisnotthereasonwhyorganicfarmersprefernaturalwastefromanimals?A.Itcankeepthefoodfreefromchemicals.B.Itcankeeptheair,soilandwaterfreefromchemicals.C.Itcankillharmfulpests.D.Itcanmakethesoilricherinmineral.C3.Theorganicfarmersdothefollowingsexcept______.A.addingfertilizerswhichisrichinmineralB.changingcropseverytwoorthreeyearsC.plantingseedsindifferentlayersofthesoilD.plantinggrassbetweencropstopreventthesoilfrombeingblownawayA4.WhichstatementisWRONGaccordingtothetext?A.Mostofthecropsareorganic.B.Recently,theterm“organicfarming”hasgainedanothermeaning.C.Manyfarmersusefertilizers.D.Scientistsbelievesomechemicalfertilizersarebetterforpeople.DSpeaking1.Whatis“organicfarming”?Answerthequestions.Itreferstocropsgrowingwithnaturalratherthanchemicalfertilizers.2.Whatproblemsarecausedbyusingchemicalfertilizers?Therearethreeproblems.1:Theykillbothhelpfulandharmfulpests.2:Fertilizersaffectthesoil,crops,animals,thewatersupplyandhumansbadly.3:Thecropsbyusingchemicalfertilizersgrowtoofast,andhavelessnutrition.3.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsis:1:togrowgoodfood2:toavoiddamagingtheenvironmentorpeople’shealth.Writing1.Asmoreandmorepeoplefocusonhealth,greenfoodhasbeguntodrawmoreandmoreattentioninrecentyears!2.Withtheimprovementofthelivingstandards,greenfoodisbecomingmoreandmorepopular.TheleadingpartPara1Greenfood,healthyfood!参考句式2.IfIhaveachoiceI'llalsochoosegreenfoodbecause....Para2Thebodypart1.Itisobviousthatthesafe,healthy,cleanandfreshfoodisourbestchoice.3.AsfarasI'mconcerned,it'sbetterto...,for...Onlyinthiswaycanwefarawayfromanypollution.Thereisnodoubtthatgreenfoodmeanshealthylife,farawayfromdiseases,withoutworriesandfullofhappiness.Para:3ConclusionCollectsomeinformationaboutthesafetyandimportanceofgreenfood.

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