人教版高一英语必修四Unit2Using-language

Unit2WorkingthelandUsinglanguageWordspreviewchemicalproductionbacteriapestnutritionmineraldiscoveryadj.化学的;关于化学的n.生产;制造n.细菌n.害虫;害兽;害鸟n.营养;滋养;食物n.矿物;矿石n.发现;发觉focussoilreducerootskimunderlinesummarycommentn.焦点;中心点vt.集中;聚焦n.土壤vt.减少;减缩n.根;根源vt.浏览;略读vt.画底线标出;强调n.总结;摘要;概要n.评论;议论vi.&vt.表达意见;做出评论Expressionspreviewbuildupleadtofocusonkeep…freefrom/of逐渐增强;建立;开发导致;造成(后果)集中(注意力,精力等)于使…免受(影响,伤害等)；使…不含(有害物)Itisfertilizer.Whatisthesubstanceweputonthesoiltomakecropsgrow?Howmanykindsoffertilizersdofarmersuse?Therearetwokinds.Theyarechemicalfertilizersandnaturalones.OrganicFarmingchemicalfertilizercowdung用化学肥料和有机肥料的区别:ReadingCHEMICALORORGANICFARMING?Chemicalfertilizerscancausemanyproblems,soorganicfarmingisbecomingmorepopular.Organicfarmingmeansgrowingcropswithnaturalfertilizer.Theorganicfarmerskeepthesoilrichandhealthy.Themainideaofthetext:Long-termuseofchemicalfertilizerscancausedamagetothelandandpeople’shealth.Problemscausedbychemicalfertilizers.ThemainideaofeachparagraphP1.P2.Farmersandcustomersturntoorganicfarming.Othermethodstokeepthesoilfertile.P3.P4.ChemicalfertilizerNotgoodforthesoilorthewatersupplyThesoilgetsexhausted.KillbothhelpfulandharmfulbacteriaandpestsChemicalfarmingadvantagesproblemscausestopcropdiseaseincreaseproductiondamagethelandbykilling…affectcropsbystaying…leadtocancer/illnessesbybuildingup…havelessnutritionbygrowingtoofastOrganicfarmingNaturalwastefromanimalsMakethesoilricherinmineralsandmorefertileAhealthysoilReducediseasesincropsHelpcropsgrowstrongandhealthyOrganicfarmingmethodsadvantagesusenaturalwastemakethesoilrichinmineralschangethecropputmineralsbackintosoil,making…plantcropswithdifferentrootsusedifferentlevelsoflandplantgrassbetweencropsprevent…from…,anaturalfertilizerOthermethods:ChangecropseverytwoorthreeyearsCorn,wheatPeas,soybeansPutthemineralsbackintothesoil,makingitrichandhealthyCropsthatusethesurfaceofthesoil(peanuts)Cropsthatneedadeeperlevelofsoil(rootvegetable)Makesurethatwhatisleftinthegroundafterharvestingbecomesanaturalfertilizerforthenextyear’scrop1.WhichstatementisWRONGaccordingtothetext?A.Allcropsareorganic.B.Recently,theterm“organicfarming”hasgainedanothermeaning.C.Allfarmersusefertilizers.D.Scientistsbelievesomechemicalfertilizersarebetterforpeople.Choosethebestanswer.D2.Whichisnotthereasonwhyorganicfarmersprefernaturalwastefromanimals?A.Itcankeepthefoodfreefromchemicals.B.Itcankeeptheair,soilandwaterfreefromchemicals.C.Itcankillharmfulpests.D.Itcanmakethesoilricherinmineral.C3.Whatistheadvantageofusingchemicalfertilizers?A.Leavingchemicalsinthegroundforalongtimeisgoodforwatersupply.B.Theycangetthesoilexhausted.C.Theycankillhelpfulbacteria.D.Theycankillharmfulpest.D4.Theorganicfarmersdothefollowingsexcept______.A.addingfertilizerswhichisrichinmineralB.changingcropseverytwoorthreeyearsC.plantingseedsindifferentlayersofthesoilD.plantinggrassbetweencropstopreventthesoilfrombeingblownawayA1.Whatis“organicfarming”?Answerthequestions.Itreferstocropsgrowingwithnaturalratherthanchemicalfertilizers.2.Whatdoorganicfarmersprefertouseasfertilizer?Thefertilizerthatorganicfarmerspreferisnaturalwastefromanimals.Farmersgrowpeasorsoybeansaftercornorwheatsothatpeasandbeanscanputmineralsbackintothesoil,makingitrichandhealthyandreadytogrowmorewheatorcorn.3.Whydoorganicfarmersgrowpeasorsoybeansaftercornorwheat?4.Whatistheadvantageofusingnaturalfertilizer?Makethesoilricherinmineralsandsomorefertile.Reducediseasesincropsandhelpthemgrowstrongandhealthy.Besides,keeptheair,soilandwateraswellasthefoodsupplyfreefromchemical.Theyareagreatwaytostopcropdiseaseandincreaseproduction.5.Whyarechemicalfertilizerssopopularinfarmingtoday?6.Whatproblemsarecausedbyusingchemicalfertilizers?Therearethreeproblems.First,chemicalfertilizersaffectthesoilandthewatersupplybadly.Second,theyallowfarmerstogrowthesamecropyearafteryearandexhaustthesoil.Third,theykillbothhelpfulandharmfulpests.7.Whatisthemainreasonforusingorganicfarmingmethods?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.MethodsoforganicfarmingAdvantagesofmethodsFarmersusenaturalwastefromanimals.Thismakesthesoilricherinmineralsandsomorefertile.Fillinthechart.Farmersoftenchangethekindofcropineachfieldeveryfewyears.Changingthecropsrenewsthemineralsinthesoilandhelpsitbecomerichandhealthy.MethodsoforganicfarmingAdvantagesofmethodsFarmersplantcropswithdifferentlengthsofroots.Farmerssometimesplantgrassbetweencropsandleaveitintheground.Thisusesdifferentlevelsofsoil.Thispreventswindorwaterfromcarryingawaysoilandactsasanaturalfertilizer.1.Itisimportanttoexplainthisagainorwewillconfusethestudents.confuse动词,表示“把(某人)弄糊涂;使迷惑”,“搞乱;混淆”。如:Theyaskedmesomanyquestionsthattheyconfusedme.他们问我那么多问题把我都弄糊涂了。MyChineseandEnglishbooksareconfusedtogether.我的中英文的书籍混在一起了。Hewasconfusedbyastrangeidea.他被奇怪的念头弄糊涂了。Pleasedon’tconfuseAustraliawithAustria.别把澳大利亚和奥地利混淆了。【拓展】confusionn.混乱;慌乱;混淆confusing和confused辨析:这两个词都是由confuse转化而来的形容词。confusing意思是“莫名其妙的;难以理解的(difficulttounderstand;puzzling)”,强调事物本身所具有的性质;confused意思是“糊涂的;迷乱的(unabletothink