Unit4《GlobalWarming》说课稿2人教版选修6.docx
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Unit4《GlobalWarming》说课稿2人教版选修6.docx
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Unit4《GlobalWarming》说课稿2人教版选修6
Unit4GlobalWarming
Period1WarmingUp
TeachingGoals:
1.Toarousestudents’interestinlearningaboutglobalwarming.
2.Togetstudentstoknowtheenergysource.
Teachingprocedures:
Step1.Leading-in
Purpose:
Toactivatestudentsandarousethemtotalkaboutglobalwarming.
T:
Hello,everyone.Todaywearegoingtoreadaboutglobalwarming.Butfirstlet’sthinkaboutwhatmovestheworldaround.Yes,itisenergy.Butwhatisenergy?
Energyisafundamentalquantitythateveryphysicalsystempossesses;itallowsustopredicthowmuchworkthesystemcouldbemadetodo,orhowmuchheatitcanproduceorabsorb.Inthepast,energywasdiscussedintermsofeasilyobservableeffectsithasonthepropertiesofobjectsorchangesinstateofvarioussystems.Basically,ifsomethingchanges,somesortofenergywasinvolvedinthatchange.Renewableenergysourceslikewindpowerdon’temitcarbondioxide.
Step2Warmingup
Purpose:
T
oleadstudentstothetopicofthisunit.
1.Pairwork
Getstudentstoaskeachotherthefollowingquestions,andthenaskthemtopresentitbeforetheclass.
(1)Whatisenergy?
(2)Wheredoesitcomefrom?
(3)Whatenergysourcesarerenewable?
(4)Whatenergysourcesarenon-renewable?
2.Groupwork
(1)Getstudentstotalkaboutsourcesofenergyaccordingtothephotosinthetextbook.
TheabovepicturescanbeusedforSstotalkabout,andSscanalsotalkasmuchastheycan.
BylearningWarmingUpweallknowthate
nergyissoimportant,butwheredoesitcomefrom?
Therearedifferentformsofenergy:
Windenergy风能Heatenergy热能Chemical
Chemicalenergy化学能源Nuclearenergy核能
Solarenergy太阳能Waterpower水力发电
能源类型
定义
实例
一次能源
直接来自自然界而未经加工转换的能源
化石燃料、太阳能、核能、生物燃料、水能等
二次能源
由一次能源直接或间接转化而来的能源
电能、煤气、汽油、沼气、氢能等
可再生能源
不随其本身的转化或被人类利用而减少的能源
太阳能、生物能、水能、风能、地热能等
非再生能源
随其本身的转化或被人类利用而减少的能源
化石燃料、核燃料
(2)Conclusion
Whenenergychangesfromoneformtoanother,theamountofenergystaysthesame.Energycannotbemadeordestroyed.Thisfactiscalled“conservationofenergy”.Mattercanbemadeintoenergythroughprocesseslikenuclearfissionandnuclearfusion.
3.Competition:
TakethequizbelowandseewhetherSscanfillintheblanks.
Thingsthat
useenergy
Sourcesofenergy
Renewable/non-renewable
lights
heating
television
cassetteplayer
videorecorder
computerfridge
stove
washingmachine
hairdryer
coal
(1)N
oil
(2)N
naturalgas
(3)N
wind(windpower)
(4)R
sun(solarenergy)
(5)R
uranium(nuclearenergy)
(6)N
water(hydro-electricpower)
(7)R
plantwaste(biomassenergy)
(8)R
hotspringsorgeysers
(geothermalenergy)
(9)R
thesea(tidalenergy)
(10)R
SuggestedAnswers:
(1)non-renewable;
(2)non-renewable;(3)non-renewable;(4)renewable;(5)renewable(6)non-renewable;(7)renewable;(8)renewable;(9)renewable;(10)renewable
4.Homework
Writeashortcompositionaboutsourcesofenergy.
Period2Pre-reading,Reading,Comprehending
TeachingGoals:
1.Toreadaboutglobalwarming.
2.Togetsomeideaabouttheeffectofglobalwarming.
3.Todevelopsomebasicreadingskills.
TeachingProcedures:
Step1.WarmingUp
Purpose:
ToarouseSsinterestinlearningaboutglobalwarming.
1.Teamwork
Answerthequestionsbelow:
(1)Haveyoueverseenagreenhouse?
(2)Howdoesagreenhousework?
(3)Whatdoyouthinkgreenhousegasesdo?
2.Groupwork
Lookatthepicture,andaskSssomequestions.
T:
Whatisthisbuildingmadeof?
S1:
It’smadeofplastic.
T:
What’sitspurpose?
S2:
Plantscangrowinitwhenit’scoldoutside.
T:
Howdoesitwork?
S3:
Theglasstrapstheheatfromthesun,makingtheairwarmsothatplantsgrowbetter.
Step2.Pre-reading
Purpose:
TogetSstolearnaboutgreenhousegases.
1.Groupwork
Nowlookattheword“GREENHOUSEGASES”.Whatdoesitmean?
Greenhousegases(GHG)aregaseouscomponentsoftheatmospherethatcontributetothegreenhouseeffect.Themajornaturalgreenhousegasesarewatervapor,whichcausesabout36-70%ofthegreenhouseeffectonEarth(notincludingclouds):
carbondioxide,whichcausesbetween9-26%;andozone,whichcausesbetween3-7%(notethatitisnotreallypossibletoassertthatsuch-and-suchagascausesacertainpercentageoftheGHE,becausetheinfluencesofthevariousgasesarenotadditive.Thehigherendsoftherangesquotedareforthegasalone;thelowerend,forthegascountingoverlaps).
Naturallyoccurringgreenhousegasesincludewatervapor,carbondioxide,methane,nitrous
oxide,andozone.Certainhumanactivities,however,addtothelevelsofmostofthesenaturallyoccurringgases.
Verypowerfulgreenhousegasesthatarenotnaturallyoccurringincludehydrofluorocarbons
(HFCs),perfluorocarbons(PFCs),andsulfurhexafluoride(SF6),whicharegeneratedina
varietyofindustrialprocesses.
Eachgreenhousegasdiffersinitsabilitytoabsorbheatintheatmosphere.HFCsandPFCs
arethemostheat-absorbent.
2.Individualwork
GetSstoanswerthesequestionsindividually.Thenletthemdiscusstheanswers.
(1)Whowrotethemagazinearticle?
Whatisthenameofthemagazine?
(2)Whatarethenamesofthethreescientistsmentionedinthearticle?
(3)Whatdotheythinkaboutglobalwarming?
Dotheyagreewithoneanother?
(4)Whatarethetwographsabout?
(5)Whatisthemaintopicofthearticle?
Step3.Reading
1.Skimming
Purpose:
Togetabriefunderstandingofthetext.
Readthroughthetext,preferablythefirstandthelastsentencesofeachparagraphandwritethekeysentenceofeachparagraph.
Keysentencesofeachparagraph:
(1)Adebateoverwhetheritishumanactivitythathascausedtheglobalwarmingorwhetheritisjustanaturalphenomenon.
(2)Manyscientistsbelievepeoplehavecausedtheincreaseintheearth’stemperature.
(3)Theincreasedextraamountofcarbondioxidetrapsmoreheatenergycausingtheglobaltemperaturetogoup.
(4)Thelevelsofcarbondioxidehaveincreasedgreatlyoverthelast100to150years.
(5)Therearesomedifferentattitudestowardsthecausesofthisincreaseincarbondioxide.
(6)Overthenext100yearstheamountofwarmingcouldbeaslowas1to1.5degreesCelsiusbutitcouldbeasmuchas5degreesCelsius.
(7)Anincreaseoffivedegreeswouldbeacatastrophe.
(8)Futurewarmingwouldcausethesealeveltorisebyseveralmeters.
(9)Somepredictanywarmingwillbemildwithfewbadenvironmentalconsequences.
(10)Morecarbondioxideisapositivething.
(11)Nooneknowswhattheeffectsofglobalwarmingwillbe.
2.Scanning
Purpose:
TogetSstohavesomedetailsinthetext.
Readthearticlecarefully.Arethesestatementstrueorfalse?
WriteaTforeachtruesentenceandanFforeachfalsesentence.
(1)Thetemperaturelastcenturydidn’tincreasemuch.()
(2)Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans.()
(3)JaniceFosterbelievesthatburningfossilfuelscausesglobalwarming.()
(4)Naturalgasisagreenhousegas.()
(5)Carbondioxideisabyproductofburningfossilfuels.()
(6)PeopleacceptCharlesKeeling’sdatabecausehetookaccuratemeasurements.()
(7)Floodingcouldbeoneoftheeffectsoffutureglobalwarming.()
(8)GeorgeHambleybelievesscientistsarejustguessingabouttheeffectsofglobalwarming.()
(9)GerogeHambleyisworriedabouttheeffectsofcarbondioxideonplantgrowth.()
(10)Itisclearwhattheeffectsofglobalwarmingwillbe.()
SuggestedAnswers:
(1)F
(2)F(3)T(4)F(5)T(6)T(7)T(8)T(9)F(10)F
3.Listening
Purpose:
TotrainSslisteningability.
Listentothetapeandfollowitinalowvoice.
4.Groupwork
Ssaredividedintofourgroups.Eachgroupissupposedtoreadthrougheachpartandthendiscussthem.
Part1(Paragraph1)
(1)compare比较
●常见用法:
①compare…with…把…和…比较
Comparedwithhim,Iamfast.
②compare…to…把…比作…
Lifeisoftencomparedtovoyage.
(2)comeabout发生
Howdiditcomeabout?
那事是怎么发生的?
●常见词组:
comeacross偶遇;碰到comeround恢复知觉,
comealong进展;进行cometo涉及;到达;共计
comeout公开;问世;出版cometooneself恢复知觉
comeupwith想出
(4)phenomenonn现象
Itisonlyasocialphenomenon,butnotaphenomenonofnature.
Part2(Paragraph2,3,4)
(1)fueln
燃料
Don’tleavetheengineswitchedon.Itwastesfuel.
●拓展:
fuelv加油;补给燃料
Thecarisbeingfuelledreadytotrytobeatthespeedrecord.
(2)quantitiesof大量
Largequantitiesofmoneyhavebeenspentonthebridge.
●拓展:
alargequantityof大量的
Heatealargequantityofnice.
(3)perprep每;每一
Thefruitcosts30penceperkilo.
Howmuchdoyouearnperweek?
Part3(Paragraph5,6,7,8,9)
(1)datan资料;数据
Wehaven’tgotenoughdata..
(2)resultin导致
Theaccidentresultedinthedeathoftwopassengers.
Itresultedinsuccess.
●拓展:
resultfrom由于
Hisillnessresultedfromeatingbadfood.
(3)catastrophen突如其来的大灾难;大灾祸
Thewarwasaterriblecatastropheinwhichmanypeopledied.
(4)climaten气候
Wehaveamildclimatehere.
(5)consequencen结果;后果;影响
Asaconsequenceofbeinginhospital,Shellydecided
thatshewantedtobecomeanurse.
●常见词组:
inconsequence因此,由此
inconsequenceof…由于…的缘故
(6)statevt陈述;说明
Thebusmenhavestatedthatthestrikewillcontinueuntilgeneralagreementisreachedaboutpayandworkingconditions.
(7)rangen&v
①种类;范围;幅度
Thereisawiderangeoftemperature.气温变化很大。
②vi(在一定范围内)变化
Thenumberrangesbetween5and15.
③vt排列,整理
Pleaserangethegoodsneatlyintheshopwindow.
Part4(Paragraph10)
(1)buildup逐步建立;增加;增进
Weneedtobuildupourreputation.
Trafficisbuildinguponroadsintothecity.
(2)Keepon继续
Pricekeptonincreasing.
Hedidn’tstoprunning;hejustkept
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