高中英语 Unit 2 Working the land Period 4 Using Language课件 新人教必修4.ppt

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1、 Unit 2 Working the land Usinglanguage2021/8/11 星期三1231.Masterthefollowingnewwords,phrasesandsentencesinusinglanguageproduction,bacteria,pest,nutrition,discovery,soil,rootregret,reduce,regretbuildup,keepfreefrom,leadto,focuson,inadditionSomeorganicfarmerspreferplantinggrassbetweencropstopreventwindo

2、rwaterfromcarryingawaythesoil2.Learntheadvantagesoforganicfarming.2021/8/11 星期三2 本课首先观看嘉世有机农业视频，引出本节题目本课首先观看嘉世有机农业视频，引出本节题目“化学耕作化学耕作还是农业耕作还是农业耕作”。进而讨论化学耕作和有机耕作的概念。化学。进而讨论化学耕作和有机耕作的概念。化学耕作的弊端是什么？为什么农民转而开始有机耕作？有机耕作耕作的弊端是什么？为什么农民转而开始有机耕作？有机耕作通过什么方法来保持土地的肥沃？然后让学生听课文录音，了通过什么方法来保持土地的肥沃？然后让学生听课文录音，了解短文的主旨以

3、及各段的大意。最后讲解短文的语言点。最后解短文的主旨以及各段的大意。最后讲解短文的语言点。最后通过改写的短文加深对本文的了解。通过改写的短文加深对本文的了解。讲解农业耕作是配有相关的视频，有助于学生理解。总结概讲解农业耕作是配有相关的视频，有助于学生理解。总结概括文章和段落大意，提高学生的理解和表达能力。听课文录音括文章和段落大意，提高学生的理解和表达能力。听课文录音有助于学生听力水平的提高。有助于学生听力水平的提高。2021/8/11 星期三3ReadingCHEMICAL OR ORGANIC FARMING?2021/8/11 星期三4What can we harvest?No pai

4、ns,no gains.2021/8/11 星期三5Addfertilizerintothesoil Howcanfarmersmaketheplantsgrowwell?2021/8/11 星期三6How many kinds of fertilizers do farmers use?naturalfertilizerorganic farmingchemicalfertilizerchemical farmingTwokinds.Discussion:Which kind of farming is better?Better2021/8/11 星期三7Lets learn more a

5、bout chemical and organic farming!Listen to the tape carefully.2021/8/11 星期三8organic farming is becoming more popular.The main idea of the text:Fast Reading2021/8/11 星期三9Long-term use of chemical fertilizers can cause damage to the land and peoples health.Problems caused by chemical fertilizers.The

6、main idea of each paragraphP1.P2.Farmers and customers turn to organic farming.Other methods to keep the soil fertile.P3.P4.2021/8/11 星期三10Careful Reading1.Whyarechemicalfertilizerssopopularinfarmingtoday?A.Becausetheyarecheap.B.Theyareagoodwaytostopcropdiseaseandincreaseproduction.C.Theycancausedam

7、agetotheland.D.Theydogoodtopeopleshealth.Paragraph I2021/8/11 星期三11Chemical farming advantages problems cause stop crop disease increase productiondamage thelandby killing the helpful bacteria and pests as well as the harmful ones.affect cropsby staying in the ground and underground water for a long

8、 timelead to cancer/illnessesby building up in peoples bodies over timehave lessnutritionby growing too fastParagraph 22021/8/11 星期三12Organic farming NaturalwastefromanimalsMakethesoilricherinmineralsandmorefertileAhealthysoilReducediseasesincropsHelpcropsgrowstrongandhealthyParagraph 32021/8/11 星期三

9、13Organic farming methods advantagesuse natural wastemake the soil rich in mineralschange the cropput minerals back into soil,makingplant crops with different rootsuse different levels of land plant grass between cropspreventfrom,a natural fertilizerParagraph 42021/8/11 星期三141.WhichstatementisWRONGa

10、ccordingtothetext?A.Allcropsareorganic.B.Recently,theterm“organicfarming”hasgainedanothermeaning.C.Allfarmersusefertilizers.D.Scientistsbelievesomechemicalfertilizersarebetterforpeople.Read again and choose the best answer.D2021/8/11 星期三152.Whichisnotthereasonwhyorganicfarmersprefernaturalwastefroma

11、nimals?A.Itcankeepthefoodfreefromchemicals.B.Itcankeeptheair,soilandwaterfreefromchemicals.C.Itcankillharmfulpests.D.Itcanmakethesoilricherinmineral.C2021/8/11 星期三163.Whatistheadvantageofusingchemicalfertilizers?A.Leavingchemicalsinthegroundforalongtimeisgoodforwatersupply.B.Theycangetthesoilexhaust

12、ed.C.Theycankillhelpfulbacteria.D.Theycankillharmfulpest.D2021/8/11 星期三174.Theorganicfarmersdothefollowingsexcept_.A.addingfertilizerswhichisrichinmineralB.changingcropseverytwoorthreeyearsC.plantingseedsindifferentlayersofthesoilD.plantinggrassbetweencropstopreventthesoilfrombeingblownawayA 2021/8/

13、11 星期三181.Whatis“organicfarming”?Answer the questions.Itreferstocropsgrowingwithnaturalratherthanchemicalfertilizers.2.Whatdoorganicfarmersprefertouseasfertilizer?Naturalwastefromanimals.2021/8/11 星期三19Becausepeasandbeanscanputmineralsbackintothesoil,makingitrichandhealthyandreadytogrowmorewheatorco

14、rn.3.Why do organic farmers grow peas or soybeans after corn or wheat?2021/8/11 星期三204.Whatisthemaingoalforusingorganicfarmingmethods?TogrowgoodfoodandtoavoiddamagingTheenvironmentorpeopleshealth.2021/8/11 星期三21NouseofchemicalfertilizersAwayfromindustrialareasAwayfromdirtywatersupplyNoairpollutionA

15、summary of organic farming:2021/8/11 星期三22FillintheblanksManyfarmerswelcome_fertilizersbecausetheyaregreatwaytostopcropdiseaseandincrease_.Butthesechemicalcan_toillnesses.Sofarmersbegantoturnto_farming.They_onkeepingtheirsoilrichand_ofdisease.Organicfarmersoftenpreferusing_wasteofanimalsasfertilizer

16、.Thiskeepsthesoilfree_chemicals.Therearemanymethodstokeepthesoil_.Themethodshavethesamegoal:togrowgoodfoodandavoiddamagingthe_orpeopleshealth.chemicalproductionfocusfreenaturalfromfertileenvironmentleadorganic2021/8/11 星期三231.Thesechemicalsinthefoodsupplybuildupinpeoplesbodiesovertime.Language Point

17、sHardworkingconditionsbuildupcharacter.buildup增强增强;建立建立;开发开发艰苦的工作条件能艰苦的工作条件能磨练磨练人的性格。人的性格。2021/8/11 星期三242.Manyofthesechemicalscanleadtocancerorotherillnesses.AllroadsleadtoRome.leadto导致；造成导致；造成条条大道通罗马。条条大道通罗马。2021/8/11 星期三253.Theyfocusonkeepingtheirsoilrichandfreeofdisease.focuson:集中集中(注意力注意力,精力等精力

18、等)于于Youshouldfocusyourattentiononyourwork.把注意力集中在你的工作上。把注意力集中在你的工作上。2021/8/11 星期三264.Thisalsokeepstheair,soil,waterandcropsfreefromchemicals.4.Youmusttakecaretokeepthewoundfreefromthedirt.keepsfreefrom/of:使使免受免受(影响影响,伤害等伤害等);使不含使不含(有害物有害物)你必须照顾好伤口，免受灰尘的伤害。你必须照顾好伤口，免受灰尘的伤害。2021/8/11 星期三275.reducev.减少

19、减少,降低降低e.g.公司尽力通过减少花销来提高利润。公司尽力通过减少花销来提高利润。Thecompanytriestoincreaseprofitsby_.今年我们已经减少了业务开支。今年我们已经减少了业务开支。We_expensesthisyear.reducing costshave reduced2021/8/11 星期三28Expressions 1.化肥化肥2.对对造成损害造成损害3.洗掉某物洗掉某物4.导致导致;造成造成(后果后果);通往通往5.逐渐增强逐渐增强,建立建立6.另外另外(还有还有)7.使使免受免受(影响影响);8.集中集中(注意力、精力注意力、精力)于于9.每隔几年

20、每隔几年10.避免做避免做chemicalfertilizerscause/dodamagetowashoffleadtobuildupinaddition(to)keepfreefrom/offocusoneveryfewyearsavoiddoing2021/8/11 星期三29Exercises washoff,leadto,buildup,inaddition(to),keepfreefrom/of,focuson,avoiddoing1.Hismistakes_hisfailure.2.Thesechemicalsinthefoodsupply_inpeoplesbodiesover

21、time.3.Allroads_Rome.4.Please_yourmind_thefollowingproblem.5.Childrenshould_violence.led tobuild upfocusonlead tobekeptfreefrominadditionwashingoffavoidmeeting6.Helikesbasketball,_,helikesfootball.7.LittleTomstuckto_themud_hisshoesbyhimselfbeforehecamein.8.Itriedto_(meet)himbecausehealwaysboresme.2021/8/11 星期三30HomeworkWriteanarticleaboutfuturefarming.Thank you!2021/8/11 星期三312021/8/11 星期三32