Unit4《GlobalWarming》说课稿2人教版选修6.docx

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