Unit 4 Global Warming 教学设计3.docx
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Unit4GlobalWarming教学设计3
Unit4GlobalWarming
教学设计3
Period1Warmingup&Pre-reading
Teachingaims:
1.ToarouseSs’interestinlearningaboutglobalwarming.
2.TogetSstoknowtheenergysource.
Teachingprocedures:
Step1Warmingup
Leadinginbybrainstorm
Putthestudentsintogroupsoffouranddiscussthefollowingquestions:
1.Whatdoweuseenergyfor?
2.Whatarethesourcesofenergy?
3.Whatsourcesarerenewableandwhatarenon-renewable?
Answers:
1.(differently)
1.Lights,heating,andallkindsofelectricequipmentuseenergy
2.coal,oil,solarpanels,nuclearenergy,naturalgas,windpower,water,plantwaste,tidalenergy,ect.
2.coal;oil;solarpanels;nuclearenergy;naturalgas;windpower;water;plantwaste;tidalenergy,ect.
3.fillinaform:
Step2Pre-reading
1.Weusemuchenergyinourdailylife,whatistheeffectofusingenergyinourworld?
Theuseofenergy---Giveoffcarbondioxide,otherwastedgasesandheatintotheair
---Theearthisbecomingwarmerandwarmer.(globalwarming)
Greenhouseeffect
2.Howdoesagreenhousework?
Thegreenhousetrapstheheatfromthesunandkeepsitfromescaping,whichcanmakeitheatupandsotheplantscangrowthroughoutthecoldperiod.
3.Underthisgreenhouseeffect,whathappens?
2.
Theearthisbecomingwarmerandwarmer.
Period2Reading&Comprehending
Teachingaims:
1.Tohelpstudentslearntounderstandthestructureofanexpositionaboutglobalwarming.
2.Tohelpstudentsbetterunderstand“theimportanceofprotectingtheearth”
3.Tohelpstudentslearntousesomeusefulwordsandexpressionsaboutglobalwarming.
Teachingprocedures:
Leadingin
TostimulateSs’interestinreadingthetext.DividetheSsintogroupsoffour.Discussthefollowingthreequestions.
1.Whatisglobalwarming?
Theearthisbecomingwarmer
2.Howhasthiscomeabout?
Humanactivity—burningoffossilfuels
Greenhouseeffect—greenhousegases—weneedgases
Hugequantitiesofextracarbondioxide
3.Whataretheeffectsofglobalwarming?
Thesealeveltorise
Severestorms,droughts,famines,thespreadofdiseases,andthedestructionofspecies.
Task1:
Skimming
AsktheSstohaveaquicklookatthemagazinearticle.Thenencouragethemtotellwhattheynoticeabouthowthetextisorganized.
(Answer:
Ithasatitle;afirstparagraphthatisinbold;themaintext;diagrams;twoquotes)
Task2:
Scanning
Toglanceatthetext,andanswerthefollowingquestions.
1.Whowrotethemagazinearticle?
Whatisthenameofthemagazine?
SophieArmstrongwrotethemagazinearticle.
ThenameofthemagazineisEarthCare.
2.Whatarethenamesofthethreescientistsmentionedinthearticle?
TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.
3.Whatdotheythinkaboutglobalwarming?
Dotheyagreewithoneanother?
Theydon'tagreewitheachother.
Dr.JaniceFosterthinkstheeffectsofglobalwarmingcouldbeveryserious.
GeorgeHambleythinksglobalwarmingwillbemildwithfewbadenvironmentalconsequences.
CharlesKeelingbelievesitistheburningofmoreandmorefossilfuelsthatisresultinginabigincreaseincarbondioxide.
4.Whatarethetwographsabout?
GraphIshowsthetemperatureincreaseofonedegreeFahrenheitbetween1860to2000.
Graph2isaboutthecarbondioxidecontentintheatmosphere,1957--1997.
5.Whatisthemaintopicofthearticle?
Globalwarming/thewarmingoftheearth.
Task3:
Intensivereading
AskSstoreadthetextcarefullyandsumupthemainideaofeachpart.
Partone(para1)
Introduceadebateovertheissueofglobalwarming.
Skills:
Raisingaquestion
Parttwo(para2-3)
Illustrate(explain)howglobalwarmingcomesabout.
Skills:
givingexamples,usinggraphs,explanation
Partthree(para4-8)
Listtwodifferentattitudesamongscientiststowardsglobalwarming.
Skills:
givingexamples,makingcontrast(comparison)
Partfour(para9)
It’suptoreaderstothinkanddecidewhetherpeopleshoulddosomethingaboutglobalwarmingornot.
Skills:
usingaquestion,leavingreaderstothinkovertheissue.
Task4:
Listening
Listentothetape.Afterit,togetSstofinishEx2onpage27.
Task5:
Discussion
Theearthisbecomingwarmer,inyouropinion,doesitmatter?
Ifitdoes,asastudent,whatcanyoudoaboutit?
Step6:
Languagepoints
1.Whatdoyouthinkgreenhousegasesdo?
本句中think后接了一个由what引导的宾语从句。
但应注意的是:
特殊宾语从句即当一般疑问句主句的谓语动词是think,believe,suppose,consider,imagine,guess和suggest等时,表疑问的词要放在主句前即句首。
[正]Whodoyouthinkwillwininthegame?
[误]Doyouthinkwhowillwininthegame?
当然一般情况下宾语从句的疑问词应放在主句之后。
[误]Whydoyouknowwecan'tcutdownthebigtree?
[正]Doyouknowwhywecan'tcutdownthebigtree?
2.compareto/with
Comparedto/withmanywomen,shewasindeedveryfortunate.
compareAwithB
Ifyoucompareherworkwithhis,youwillfindhersismuchbetter.
compareAtoB
Poetshavecomparedsleeptodeath.
3.Thereisnodoubtthat….
Thereissomedoubtwhether….
主句为肯定句时,doubt后使用连词whether。
主句为否定句时,doubt后则使用连词that。
eg:
There'snodoubtthatonedayacurewillbefound.
Thereislittledoubtthathewasthekiller.
4.amountof
anamountof相当数量的;一些
anyamount(of)任何数量(的);大量(的)
beoflittleamount不重要;无价值
n.数量
largeamountsofmoney大量的金钱
eg:
Theamountofmoneyshouldbewrittenbothinwordsandinfigures.
钱数要用字和数码写出来。
5.Withoutthe‘greenhouseeffect’,theearthwouldbeaboutthirty-threedegreesCelsiuscoolerthanitis.
如果没有温室效应,地球会比现在冷33℃。
这是一个含蓄虚拟条件句。
应该注意有时假设的情况并不以条件从句形式表示出来,而是通过一个介词短语或其他方式表示。
常用的词或短语有:
without,butfor,butthat,otherwise,or,but等。
eg:
Withoutyourhelp(=Ifwehadnothadyourhelp),wecouldnothavesucceeded.
要是没有你的帮助,我们是不会成功的。
Butforelectricity(=Iftherewerenoelectricity),therewouldbenomodemindustry.
要是没有电,就不会有现代工业。
Hewashavingameetingwithhisstudents;otherwise,hewouldhavecome.
他当时正与他的学生进行讨论,否则的话他就来帮我们了。
Hefeltverytiredyesterday,orhewouldhaveattendedtheparty.
他昨天很累,不然他就参加那个聚会了。
6.resultin导致,造成=leadto
Theaccidentresultedinthreepeoplebeingkilled.
这一事故导致他的死亡。
Theaccidentresultedinhisdeath.
resultfrom由…产生,发生
injuriesresultingfromafall.
Theaccident______thedeathoftwopassengers.(B)
A.resultedfromB.resultedin
C.resultedofD.resultedwith
7.ontheotherhand:
另一方面
ontheonehand,ontheotherhand
I'dliketoeatout,butontheotherhandIshouldbetryingtosavemoney.
Iwanttogototheparty,butontheotherhandIoughttobestudying.
我想去参加聚会,但从另一方面来说,我应该留下来学习。
8.concernn.有厉害关系;所关切的事
It’snoconcernofmine.这事与我无关。
n.worry,anxiety担心;担忧
Sheshowedgreatconcernaboutyou.
她很为你担心。
v.tohavetodowithorrelateto涉及;与……有关或相关
Attendtowhatconcernsyou.注意与你有关的事物。
v.Tobeofinterestorimportanceto(常与with,about,in连用)关心;关照
We’reratherconcernedaboutfather’shealth.
我们相当担心父亲的健康。
9.consequence
inconsequence因此
asaconsequence结果
asaconsequenceof由于…的结
10.range
in/withinrange在射程之内
outof/beyondrange在射程之外
11.buildup
Buildupthebusiness
Sediment(沉淀物)buildsupontheoceanfloor.
Thisbuiltupmyhopeaftertheinterview.
12.evenif/though
Iwouldn'ttellyouevenifIknew.
Evenifshesurvives,she'llneverfullyrecover.
Eventhoughhe's24now,he'sstilllikealittlechild.
Icanstillremember,eventhoughitwassolongago.
Period3Learningaboutlanguage
Teachingaims:
1.ToenableSstomastersomeusefulwordsandexpressions.
2.Todiscoverusefulstructures.
3.TogetSstohaveknowledgeofthegrammarpoint:
theuseofit.
TeachingProcedures:
Step1Freetalk
GetSstotalkaboutwhatcausesglobalwarming.
Step2Wordstudy
Purpose:
Toconsolidatethewordsandphrasesinthetext.
1.Individualwork
Gooverthenewwordsandphrasesintheprevioussections.Thencompleteeachsentencewithoneofthosenewwordsorphrases.
(1)CharlesKeelingcollectedonthecarbondioxidecontentintheatmosphereoveraforty-yearperiod.Hefoundthattheamountofcarbondioxide_________increasingduringthattime.
(2)Althoughweareburningcoalinhugeeveryyear,wewon’tofitforcenturies.
(3)Iftheamountofgreenhousegasescontinuestowecouldbefacingaglobal.
(4)Manyscientistsbelievethatglobalwarminghasthroughtheburningoffossilfuels.Theydonotthinkthatignoringtheissueisworththe_______.
(5)describesweatherconditionsoveraperiodofyearsinaparticularplace.
(6)Theofarisingsealevelwouldbewidespreadflooding.
(7)TheuseofenergyinSusanna’scountryislowtheuseofenergyintheUSA.
(8)Thewarmingoftheearthisathatcausegreatconcern.
(9)Theshowstemperaturechangesduringthe20thcentury.
(10)Onehectareofforestcanabsorb23tonsofcarbondioxideyear.
SuggestedAnswers:
(1)data,kepton
(2)quantities,runout(3)buildup,catastrophe(4)comeabout,risk
(5)Climate(6)consequence(7)comparedto(8)phenomenon(9)graph(10)per
2.Pairwork
Lookatthetwographsonpage26.Thencompletetheparagraphsaboutthemwithappropriatewords.Dotheexerciseinpairs.
Thefirstgraphshowstheglobalbetweenand.ThetemperatureanddecreasedoverthisperiodbutonthewholeitbyaroundonedegreeFahrenheit.Duringthistime,theearthreacheditstemperatureinaboutanditshighestin2000.Therewasasteadyinthet
temperatureduringthetwentyyearsafter1980.Wecanseefromthegraphthattheearthhasbecomesinceearlylastcentury.
Thesecondgraphshowstheamountofintheatmospherefromto
.Thecarbondioxidesteadilyoverthisforty-yearperiod.Itwentupfrom315to370parts