【公開課課件】人教必修四 Unit 2 Using Language

Unit2WorkingthelandUsingLanguageLearningaims1.Totalkaboutorganicfarming&greenfood.2.Tolearnsomekeylanguagepoints.3.Topractisetheskillsofreading,listening,speakingandwriting.*grownin______air*freeofp_______*_______nutrition*do_____topeople’shealthandthee___________cleanollutionrichingoodnvironmentHowdoyouunderstandgreenfood?Leading-insafefood

greenfood≈

organicfood

Safeornot?Whatisthethingweputonthesoilwhichmakescropsgrow?Itisfertilizer.chemicalfertilizersnaturalfertilizersChemicalOrOrganicFarming?Whatisthemainideaofthispassage?Thispassagetellsussomethingabout

.organicfarmingtask1Findoutthemainideaofeachparagraph.task2FastreadingC.Whatisorganicfarming?D.Someproblemscausedbyusingchemicalfertilizers.Theadvantagesoforganicfarming.B.Somemethodsofkeepingthesoilfertile.Para.1Para.2Para.3Para.4Matchthemainideaforeachparagraph.Theyareagreatwaytostopcropdiseaseandincreaseproduction.1.Whyarechemicalfertilizerssopopularinfarmingtoday?

CarefulreadingReadthepassageandanswerthefollowingquestions.First：Theycandamagethelandbykillingthehelpfulbacteriaandpestsandstayinginthegroundandundergroundwaterforalongtime.Second：Theydamagepeople'shealthbybuildingupintheirbodiesandleadingtocancerorotherillnesses.2.Whatproblemscanbecausedbyusingchemicalfertilizers?Organicfarmingissimplyfarmingwithoutusinganychemicals.3.Whatisorganicfarming?Themainreasonforusingorganicfarmingmethodsistogrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealth.4.Whatisthemainreasonforusingorganicfarmingmethods?

1.buildup逐漸積聚;增進，增強Trafficonthisroadisbuildingup.這條路上的車輛日益增多。PractisingChinesekungfucannotonlybuildupone’sstrength,butalsodevelopone’scharacter.練習中國功夫不僅可以強身健體，還可以完善一個人的性格。Languagepoints2.leadto導致;通向Hismistakesledtohisfailure.他的失誤導致了他的失敗。Thisroadleadstotherailwaystation.這條路通向火車站。【即學即練】單句改錯Lazinessleadstofailtheexam.___failingledto中的to是介詞，后應該接名詞或動名詞作賓語。3.focuson集中（注意力、精力）于Theyfocusonkeepingtheirsoilrichandfreeofdisease.他們關心的是保持土壤肥沃并免受病害。Pleasefocusyourattentiononthefollowingproblems.請把注意力集中在下面的問題上。類似的表示“注意”的短語：payattentionto/devoteoneselftoAllherenergiesarefocusedtoherchildrenandsheseemstohavelittletimeforanythingelse.【解題關鍵】句意：她所有的精力都集中在孩子們身上，看起來很少有時間顧及其他。focus…on…把……集中于……。【即學即練】單句改錯＿on4.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.像豌豆或大豆這樣的農作物將重要的礦物質帶回土壤，從而使之適宜于種植要求土壤肥沃的農作物，比如小麥或玉米。本句中makingitreadyfor…為動詞的ing形式作結果狀語。注意：動詞的ing形式作結果狀語時表示自然而然的結果；而不定式todo作結果狀語時往往表示出乎意料的結果。【即學即練】單句語法填空。(2016·北京高考)Newly-builtwoodencottageslinethestreet,__________(turn)theoldtownintoadreamland.2.Wehurriedtotheclassroomonly_______(find)nonethere.turningtofind1.PaulthinksthatCarrieisnottellinghimthetruth.2.Usingchemicalfertilizersalwaysmakesvegetablesemptyinside.3.Today’sfruitisnotashealthyforpeopleasfruitfiftyyearsago.4.Eatingmorevegetablesmightnotalwaysbegoodforus.5.Alloftoday’svegetableslookhealthybutinfactarenot.T

T

T

FFListeningWhatmakestheworld’sdesertsgrow?ListeningonPage48ListeningListentothetapeandtickwhatyouhear.1.Heatandlittlerain.2.Turningforestsintofarmland.3.Overusingfieldstofeedfarmanimals.4.Usingnewscientificfarmingmethods.5.Wastingwaterinfarmsandathome.6.Farmingtoomuchonpoorland.I’mgreat!1.WhywasNorthAfricaimportantinthefirstcenturyBC?A.RomesentalotofcornandwheattoNorthAfrica.B.LandinNorthAfricawasusedtoproducethebreadthatfedallofRome.C.ThedesertinNorthAfricawasfamousinRome.Listentothetapeagainandchoosethebestanswertoeachquestion.2.Howdoesfarmlandturnintodesert?A.Windblowsawaydrysoilandthenthelandbecomessandy.B.Hotweathermakesthelandbecomesandy.C.Toomanyplantscanmakefarmlandbecomedesert.3.HowarenewfarmingmethodshelpingtostopthedesertinXinjiang?A.Themethodsletthefarmersuselesswater.B.Themethodsletfarmersgrowthesameamountofcropsinlessland.C.Themethodsdonotusefertilizers.◎WritingTaskonPage53Classexercises

Samplewriting

1,600yearsagotheChinesewriterJia

SixiewroteabookQiMinYaoShuaboutgoodagriculturalpractices.TodaysomeofJia

Sixie’sideasarestillveryusefultoourmoderntimes,butwehavesomeproblemstodaythatheneverhadinhistime.SomeofJia

Sixie’sideasarestillveryusefultoourmoderntimes.Farmersstillcleartheirfieldsofweeds.Theystillploughdeeplythefirsttimeandlessdeeplythesecondtime.Inaddition,farmerseverywherestillunderstandthatchangingcropsinthefieldsisstillimportant.However,wehavesomeproblemstodaythatJia

Sixieneverfacedinhistime.Wehaveenvironmentalpollutionthatharmsfieldsandcrops.Wehavegreatcompetitioninthemarketplace.Wehavenew