英语教案－Senior 3 unit4 lesson15.doc

英语教案Senior 3 unit4 lesson15 高三Unit4Lesson14 Step1Revision 1RevisethedialogueinLesson13,payingspecialattentiontointonation. 2ChecktheSsdialogues. Step2Discussionandpresentation SBPage20,Part1.GetSstotalkaboutthepictureanddescribewhattheycansee;Readaloudthequestions,thenputSsintogroupsoffourandgetthemtodiscussthesequestionsbriefly.AskdifferentgroupsfortheiranswersandwritetheseontheBb.ThensayNowreadthepassageandfindout.AllowtheSsenoughtimetoreadthetext,thenputtheminpairsandgetthemtoparetheiranswers.Collecttheanswersfromtheclass.Answers: 1Itisbeingbuilton;itisbeinglostbytheactionsofthewindandtherain;landisbeingtoosalty. 2Youcanincreasetheareaoffarmlandbyirrigation;youcanbuilddamsandwateryourfields;youcanpumpwaterfromlow-lyingareas;youcandevelopnewplantswhichproduceheaviercrops;youcandevelopnewplantswhichgrowinpoorsoil;youcandevelopnewplantsthatarelesslikelytobeattackedbypestsanddiseases. Step3Reading AsktheSsmorequestionsaboutthepassage.Letthemreadthewholepassagecarefullyandanswerthequestions,workinginpairsorsmallgroups.Checktheanswerswiththewholeclass.Thisisagoodtimetodealwithanylanguageproblems.SeeiftheSscanguessthemeaningofsalty,ruin,storage,daybyday,etc. Notes: aFeedtheworld:In1994,ProfessorPimentelofComellUniversitywarnedofthefollowingproblemsinprovidingenoughfoodfortheworldsgrowingpopulation: *By2100thepopulationwillbe12-15billion,orseventimesitssustainablelevel. *Farmersareabandoning25millionacreseachyearbecauseofsoillossorwaterlogging. *Thedecliningfertilityofthesoilwilllowerfoodproductionby20%inthenext25years. *Topsoilisbeinglost40timesfasterthanitcanbereplaced. *Croplossesdestroyedbypestshaveincreasedfourtimesinthelast50years. bItisthoughtthat:Notetheuseofthepassiveforintroducinganidea. cForonething:ThisphraseislinkedtoTheprevioussentence.=Onereasonwhyitisdifficulttofeedtheworldspopulationisthat. dsuitableforgrowingcrops:Pointoutthestructure:suitable+for+-ing eAndthisareaisbeingsmallerdaybyday. =Andthisareaisbeingsmallereveryday.fitisbeingbuilton=buildingsarebeingbuiltontheland gpests:insectsoranimalsthatdestroyplants,food,etc. hFAO:TheFoodandAgriculturalOrganizationoftheUnitedNationswasfoundedin1945andhasitsheadquartersinRome.Ithasabout160members.Thepurposeoftheorganizationistoimproveruralconditions,agriculturalproductionanddistribution,andtoraisenutritionallevels. iinstorage=whileitisbeingstored jdamp=fairlywet.Theatmospherecanbeverydampduringtherainyseasonandgraincanstarttogobad. koneinten=onepersonoutoften lstarvetodeath:asetexpression=diebecausetheydonothaveenoughtoeat mTaketheAswanDamforexample=considertheexampleoftheAswanDam nwestoftheUSA:particularlythedesertlandtotheeastofthehighmountains ocorncrops:here,cornmeansmaize.plow-lyingareas:Manyoftheseareasarebelowsea-level. Step4Readingaloud SpeechCassetteLesson14.PlaythetapeofthepassagefortheSstolistenandfollow.Playthetapeofpartofthepassageoncemore;thistimetheSslistenandrepeat.Payattentiontostressandintonation,alsothesentencestressofthelongersentences. Step5Notemaking SBPage21,Part3.GetSstodothisexerciseindividually,sothateveryShastomakeanefforttore-readthetextandextracttherelevantinformation.Ifitisdoneinclass,getSstochecktheirnotesafterwardsinpairs.Alternatively,ifyouwish,youcansetthisexerciseforhomework.Inthatcase,getSstochecktheirnotesinpairsatthebeginningofthenextlesson. Notes: FACTS 1Firstrecordofagriculture(date/place):10,000yearsago,inEgypt,theMiddleEastandIndia. 2Presentworldpopulation:almost6billion 3Farmingpopulation:1billion 466%oftheworldssurfaceissea. 511%ofthelandsurfacecanbeusedfor growingcrops.REASONSFORLOSSOFFARMLAND 1Itisbeingbuilton; 2Itisbeinglostbytheactionsofthewindandtherain; 3Landisbeingtoosalty. WAYSOFINCREASINGFOODPRODUCTION 1Youcanincreasetheareabyirrigation;youcanbuilddamsandwateryourfields;youcanpumpwaterfromlow-lyingareas; 2Youcandevelopnewplantswhichproduceheaviercrops; 3Youcandevelopnewplantswhichgrowinpoorsoil; 4Youcandevelopnewplantsthatarelesslikelytobeattackedbypestsanddiseases. Step6Reference SBPage21,Part4.ReadtheinstructionandcheckthattheSsknowwhattodo.Dothefirsttwoitemsorallywiththewholeclass.ThenlettheSsworkthroughthisexerciseinpairs.Checktheanswersattheend.Answers: 1about10,000yearsago 21billionpeople 3howtofeedagrowingworldpopulation 4thesea 511%oftheearthslandsurface 6farmland 7desertlandcannowbeusedforgrowingcrops 8newtypesofplants Step7Workbook WbLesson14,Exx.1and2. Ex.1shouldbedoneinclass.TheSshavetomakeanefforttorevisethetextandpletethepassageindividuallyoringroups.Thenchecktheanswerswiththewholeclass. Ex.2canbedoneorallyinclass.YoumaychangeittoaChinese-EnglishtranslationexerciseandgettheSstogiveyoutheEnglishwithoutlookingatthebook. Step8Consolidation AskSstosaywhatishappeningaboutfarmlandandfoodproductioninChina.Getthemtogivespecificexamples,forexampletheThreeGorgesprojectandotherchangesinthei