高一英语 Unit2 Using language课件 新人教版必修4 课件VIP免费

Wordspreviewchemicalproductionbacteriapestnutritionmineraladj.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discoveryfocussoilreducerootn.发现；发觉n.焦点；中心点vt.集中；聚焦n.土壤vt.减少；减缩n.根；根源Wordspreviewskimunderlinesummarycommentvt.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WordspreviewExpressionspreviewbuildupleadtofocusonkeep…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)OrganicFarmingWhataregenetically-modifiedfoods?ThetermGMfoodsorGMOs(genetically-modifiedorganisms)ismostcommonlyusedtorefertocropplantscreatedforhumanoranimalconsumptionusingthelatestmolecularbiologytechniques.WhataresomeoftheadvantagesofGMfoods?Theworldpopulationhastopped6billionpeopleandispredictedtodoubleinthenext50years.Ensuringanadequatefoodsupplyforthisboomingpopulationisgoingtobeamajorchallengeintheyearstocome.GMfoodspromisetomeetthisneedinanumberofways:1).pestresistance2).diseaseresistance3).coldtolerance4).droughttolerance/salinitytolerance5).nutritionWhataresomeofthecriticismsagainstGMfoods?MostconcernsaboutGMfoodsfallintothreecategories:environmentalhazards,humanhealthrisks,andeconomicconcerns.Readandanswer:Whatisthemainideaofthispassage?Thispassagetellsussomethingaboutorganicfarming.Itmeansgrowingcropswithoutchemicalfertilizerswhichdamagethesoil.Theorganicfarmerskeepthesoilrichandhealthyinseveralways.1Whyarechemicalfertilizerssopopularinfarmingtoday?2Whatproblemscanbecausedbyusingchemicalfertilizers?3Whatisorganicfarming?4Whatisthemainreasonforusingorganicfarmingmethods?Readthepassageandanswerthefollowingquestions.1Whyarechemicalfertilizerssopopularinfarmingtoday?Theyareagreatwaytostopcropdiseaseandincreaseproduction.2Whatproblemscanbecausedbyusingchemicalfertilizers?Theycandamagethelandbykillinghelpfulbacteriaandpetsandbystayinginthegroundandundergroundwaterforalongtime,Theydamagepeople'shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.3Whatisorganicfarming?4Whatisthemainreasonforusingorganicfarmingmethods?Organicfarmingmeansgrowingcropswithoutusinganychemicals.Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandtoavoiddamagingtheenvironmentorpeople’shealth.Findandwritedownthemethodsandadvantagesinthepassage.MethodsoforganicfarmingAdvantagesofmethodsFarmersusenaturalwastefromanimals.Thismakesthesoilricherinmineralsandsomorefertile.MethodsoforganicfarmingAdvantagesofmethods1Farmersusenaturalwastefromanimals.1Thismakesthesoilricherinmineralsandsomorefertile.2Farmersoftenchangethekindofcropineachfieldeveryfewyears.2Changingthecropsrenewsthemineralsinthesoilandhelpsitbecomerichandhealthy.MethodsoforganicfarmingAdvantagesofmethods3Farmersplantcropswithdifferentlengthsofroots.3Thisusesdifferentlevelsofsoil.4Farmerssometimesplantgrassbetweencropsandleaveitintheground.4Thispreventswindorwaterfromcarryingawaysoilandactsasanaturalfertilizer.Languagepoints1Thesechemicalsinthefoodsupplybuildupinpeople’sbodiesovertime.buildup增强;建立；开发Hardworkingconditionsbuildupcharacter.艰苦的工作条件能磨练人的性格。2Manyofthesechemicalscanleadtocancerorotherillnesses.leadto:导致；造成Toomuchworkandtoolittlerestoftenleadtoillness.过量的工作和过少的休息会引起疾病。AllroadsleadtoRome.条条大道通罗马。3Theyfocusonkeepingtheirsoilrichandf...