英语教案－高中英语第二册第34课.doc

英语教案高中英语第二册第34课 CAIDemonstrationClass SavingTheEarth October16,2000 ByZhaoxiangZhou I.Teachingfocus 1.Realizethedamagecausedtotheworldandfigureoutthereasons. 2.Findwaystostoptheearthfrombeingpollutedbydiscussingingroups. II.Teachingapproaches Elicitation,MutualInteraction III.Teachingaid Interactivemultimediateaching IV.Teachingprocess Step1Revision 1.Checknote-making Earth:notenoughrain,toomanycattle,cuttingdowntrees,strongwinds Air:smokefromfactories,powerstations,cars,chemicalrain,aidentsatpowerstationsandfactories Water:wastefromfactoriesandcities Step2Presentation 1Presentaseriesofimagesdepictingthenaturalbeautyoftheearth,thenthepollution.Highlightthesharpcontrastbetweenthem.Guidethestudentstotheconclusion:Theearthusedtobemuchmorebeautifulthannow;theearthisindangerduetotheincreasingpollution. 2Studythemaponthetextbook,thenscanthepassagestofigureoutwhereontheworldatlasthedamagehashappened.Encouragethestudentstogiveouttheirpointofviewtowardthepollutionissue. Step3AudiovisualLearning Thestudentswatchavideoonthetext,thendothefollowingtrueorfalsequestions. 1.Manypartsoftheworldwithlargepopulationandplentyofcropshavebeedeserts.T 2.Landmaybeepooriffarmersdonotlimitthenumbersoftheircattle.T 3.Goodsoilisgraduallylostthesedaysastreesarebeingcutdown.T 4.Airpollutionandwaterpollutionarethetwocausesoftheproblemthatmanypartsoftheworldhavebeedeserts.F 5.Chemicalsinthesmokefrompowerstationscantravelhundredsofmilesinthewindbeforefallingdowntothegroundintherain.F 6.Afterabadaidentatanuclearpowerstation,50%ofthetreesinGermanyweredamaged.F 7.ThewritertoexplainhowwaterispollutedusestheexamplesoftheaidentsinbothIndiaandRussian.F 8.Onceoceansarepolluted,theyarenotabletocleanthemselves.F Step4IntensiveReading Readthepassagesagainforsomedetailedinformation 1.Tosaysomethingaboutthedamagethatiscausedtotheworldbypollution,usingtheinformationfromthetext.Trytopresentpossiblewaystohelpsolvetheproblems. Phenomena Causes Suggestions E A R T H Theareaofdesertisgrowingeveryyear. Cattleeatgrass. Limitthenumberofthecattle. Goodsoilisgraduallylost. Treesbeingcutdown;strongwindsblowingthevaluablesoilaway. Plantmoretreesandtrytoprotectthem. A I R Airisbeingpolluted. Factories,powerstationsandcarsproducealotofwaste. Alotofthingshavetobedonetoreducepollution.Newlawsshouldbepassedandpeopleshouldrealizehowserioustheproblemis. AlotofpeoplediedfrompollutedairinbothRussiaandIndia. Therewereseriousaidentsthatpollutedtheair. Treesintheforestaredestroyedandfishinthelakesarekilled. Chemicalrain. W A T E R Insomeplacesitsnolongersafeforswimming,norisitsafetoeatthefish. Factoriesandcitiesproducealotofwaste. Sameasabove. LakeBaikal,whichusedtobecleanestItheworld,snowpolluted. Wasteproducedfromachemicalfactory. 2.tosummarizethetextbygivingthemainideaofeachpassage. Earth: Theareaofdesertisgrowingandgoodsoilisgraduallylost. Air: Chemicalsinthesmokecausealotofdamageandseriousaidentstookplace fromtimetotime. Water: Waterpollutioniscausedbymanswaste.Thewatersofthisgreatlakehavebeendirtiedand4800squarekmofoceanwerepollutedbyoil. Step5Discussion Appointonestudenttohostthediscussion.Therestoftheclassfallintogroupsof4,changingideasonthefollowingquestion. (1)Whatkindofpollutioncanyouthinkof? (2)Whytreesareimportant? (3)Whatarethecausesofwaterpollution? (4)Whatcanbedonetostoplandfrombeingintodesert? (5)Whatelsedoweknowabouttheproblemsthattheearthisfacing? (6)Whatstepsshouldwetaketosavetheearth? Step6Roleplay Thestudentstaketurnstoplaytheroleofanewspaperreporter,makinginterviewswithheadsoffactories(e.g.Apapermakingfactory)whichareseriouslypollutingairand/orwater.Recordtheinterviewsandposeareport. Step7Assignment （1）Readtheadditionalmaterialsaboutpollutionanddothereadingprehensionexercises. （2）Finishthereport. Thanksforattendingthisclass! _-_ 资料我国环境污染现状令人担忧 据专家估计，中国每年因环境污染造成的损失达到二千八百三十亿元人民币，其中，仅水污染一项，估计一年造成经济损失约五百亿元。 据香港东方日报报导，自六十年代至今，中国有环境监测的四百三十二条大小河流中，八成受到不同程度的水体污染，其中大江河经过城镇河段的占二成，支流受污染的占六成，全中国二千八百多个湖泊，凡能接纳城镇污水的，大多出现水体负氧化现象。由于地下水过度开采，京津沪大面积出现土地沉降一点五公尺至二公尺，桂林溶岩区三十米地下水重金属超标十至二十倍。 大气污染造成的经济损失约为二百亿元，由于城市燃煤、工厂排放废气及汽车死气污染，大气中二氧化硫、一氧化碳等有毒悬浮微粒弥漫在城市上空，空气污染导致许多城市肺癌死亡率增至万分之二，全国酸雨覆盖面积已达百分之三十，所有这些损失加起来也等于二百亿元。 而生态环境破坏和自然灾害造成的损失估计高达二千亿元，森林覆盖率由四九年的三成左右，现已