【公开课课件】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逐渐积聚;增进，增强Trafficonthisroadisbuildingup.这条路上的车辆日益增多。PractisingChinesekungfucannotonlybuildupone’sstrength,butalsodevelopone’scharacter.练习中国功夫不仅可以强身健体，还可以完善一个人的性格。Languagepoints2.leadto导致;通向Hismistakesledtohisfailure.他的失误导致了他的失败。Thisroadleadstotherailwaystation.这条路通向火车站。【即学即练】单句改错Lazinessleadstofailtheexam.___failingledto中的to是介词，后应该接名词或动名词作宾语。3.focuson集中（注意力、精力）于Theyfocusonkeepingtheirsoilrichandfreeofdisease.他们关心的是保持土壤肥沃并免受病害。Pleasefocusyourattentiononthefollowingproblems.请把注意力集中在下面的问题上。类似的表示“注意”的短语：payattentionto/devoteoneselftoAllherenergiesarefocusedtoherchildrenandsheseemstohavelittletimeforanythingelse.【解题关键】句意：她所有的精力都集中在孩子们身上，看起来很少有时间顾及其他。focus…on…把……集中于……。【即学即练】单句改错＿on4.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthatneedrichandfertilesoil.像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于种植要求土壤肥沃的农作物，比如小麦或玉米。本句中makingitreadyfor…为动词的ing形式作结果状语。注意：动词的ing形式作结果状语时表示自然而然的结果；而不定式todo作结果状语时往往表示出乎意料的结果。【即学即练】单句语法填空。(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

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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