Unit13TheWaterPlanet教案精品文檔

1、unit 13 the water planet教案unit13thewaterplanetperiod1readingteachinggoals:.togetthesstounderstandthemainpropertiesofwaterbyconnectingthemwithsomecommonphenomenaandlearningtoexplainthephenomena.2.toenablethemtobeawareoftheimportanceofwater,makinggooduseofwaterinaproperwayandprotectingwaterresources.t

2、eachingsteps:step1:leadinreadashortpoemandguessitsname:aletterfrom_.dearuser,shametoyouall,theignorant,iamyourlifebutyouseemnottovaluemegivemealltherespectforinmeiseternallifeifyoucontinueabusingmesurely,allformsoflifewillwitherawayhaveyoueverimagined,lifewithoutme?itellyou,itwillbeunbearablethinktw

3、iceforeverydropcounts.qs:1)whatdoes“dearuser”herereferto?2)whatdoesittalktoitsusers?3)onwhichplanetdoesitexist?ontheearth,whichisalsocalledthewaterplanet.4)doyouknowwhyitiscalled“thewaterplanet”?becauseaboutthreequartersoftheearthiscoveredbywater.step2:pre-readinglookatthetitlesinthetextbelow.donotr

4、eadthewholetext.pickoutthesubjectofeachparagraph.usethestructuresbelowtomakesixquestionsrelatedtothesubjects.step3:whilereading:.skimtofindbasicfactsaboutlifeintheoceansfromtheopeningparagraph:lifeonearthbeganintheoceansaboutthreebillionyearsago;99%ofthelivingspaceonearthisintheoceans;thereareaboutf

5、ivemillionspeciesintheoceans;lifeintheoceansrangesfromtinyplanktontogiantwhales.2quiz:trueorfalsequestions:）waterisaliquidatroomtemperature,andithasarelativelyhighfreezingpoint.2）thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.3）likealltheothersubstances,watergetssmal

6、lerwhenitfreezes.4)purewaterhasahigherfreezingpointandlighterthansaltwater.5)thesalinityoftheearthsoceansisabout3.5%.6)whenwaterfreezes,itsdensityincreases.7)otherrecoursessuchasoil,gas,goldetcisaspreciousasadropofrain.8)thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiants

7、likesharksandwhales.9)thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.0)purewaterhasahigherfreezingpointandislighterthansaltwater.1)ifasubstancehasadensity888kg/m3,itwillfloatonwater.2)theheatcapacityisrelativelyhigh,sothatmostanimalsdontlikelivinginit.3)themostimportantthingwecanlearnabout

8、water,isthatwemustprotectitanduseitwisely.3.multiplechoices:1.basedonpara.i,theauthortellsusthattherearevariousspeciesintheoceans,indicatingthat_.a.waterplaysagreatroleformarinelife.b.oceanisagoodplaceforlife.c.therearemanyreasonsfortiniestplanktonandgiantslikesharksandwhalesd.oceanispartoftheearth2

9、.thewaterintheoceanisalwaysmovinginthat_.a.thetemperatureofseawaterisrelativelyhigh.b.watersdensityaffectchangesinsalinityandtemperature.c.changesinsalinityandtemperaturehaveeffectonwatersdensity.d.watersinriversalwaysflowintotheocean.3.generallyspeaking,humanbeingsare_tolargeorsuddenlychangesintemp

10、erature.a.generousb.objectivec.subjectived.sensitive4.canyouanswerthefollowingquestions?)whatistheimportanceofthechemicalstructureofwater?thechemicalstructureofwatermakesitanexcellentmediumforlifeandalsomakesitdifferentfromalmosteverythingelseonearth.2)whatisthesalinityoftheearthsoceans?thesalinityo

11、ftheearthsoceansisaboutthirty-fivepartsperthousand,meanigthatthereareabout35grammesofdissolvedsolidsandgasesinonekilogrammeofwater.3)howaboutdensityandheatcapacity?densityistherelationshipbetweenmassandvolume,measuredinkilogrammespercubicmetre.heatcapacitytheamountofenergyittakestoraisethetemperatur

12、eofasubstancebyonedegreecentigrade.5.furtherunderstandingbylookingatsomepictures:readfollowingstatementandthinkwhatconclusionyoucandraw?orwhatpropertydoesitreferto?itissaidthatamanof60kglosesabout1lwaterthroughbreathandskinevaporationeveryday.inotherwords,539kcalheatisreleasedinthesetwoways.ifsomuch

13、heatwerekeptinhumanbody,itwouldraisebodytemperatureby9.canyouimaginetheresult?waterhasarelativelyhighheatcapacityandcanaccommodatetheclimateautomatically.itcanabsorbandreleasealotofheatwithoutbigchangesinitstemperature,thuscreatingastableenvironment.herearesomemorefamiliarphenomena,whatpropertyofwat

14、eraretheyrelatedto?thecoastalareasareoftenneithertoohotnortoocold.icefloatsonwater.whentheseawaterinacontainerisevaporated,therewillbesomesaltleft.irrigateinwintercanhelpraisethesoiltemperature.peopleswimminginthedeadseafloat;theycanevenreadapaperwhilelyingontheirbackinthewater.discussion:inthepassa

15、gemanypropertieshavebeentalkedabout.arethereanyotherpropertiesyouthinkimportantnotmentioned?homework:trytothinkasmanyexamplesaspossibletoshowthatwaterismadeuseoftobringbenefittohumanbeings.period2post-reading&listeningteachinggoals:.togetstudentshaveabetterunderstandingofwater.2.tolearnsomenewwo

16、rdsandsentencestructures.teachingprocedures:partonepost-readingi.betterunderstandthepropertiesofwater.“wherethereiswater,thereislife!”canyouusesomefactstoillustrateit?waterisamediumforlife.sofarasweknow,lifeonlyexistsonearth,becausethereiswater.etc.2.ourplanetisawaterplanetofwhichtwothirdsofitssurfa

17、ceiscoveredbywater.whatsmore,ourbodyisalsomainlycomposedofwater.doyouknowfollowingfigureswhichshowhowmuchwaterthereisinpartsofourbody?60%,70%,82%,90%upto_ofthehumanbodyiswater._ofthebrainiscomposedofwater._bloodismadeupofwater.thelungsarenearly_water.3.wateristhesourceoflife.thatswhywaterisanexcelle

18、ntmediumforlife.andyouknowallthisisbecauseofwatersuniqueproperties.ii.revisiononthepropertiesofwater.whatarethepropertiesofwater?waterispolar.waterisliquidatroomtemperature.waterhasarelativelyhighfreezingpoint.waterhasdensity1,000kg/m3.waterhashighheatcapacity.2.whatcauseswatertohavesuchuniqueproper

19、ties?itsmoleculeform/chemicalstructure.3.whatiswatermoleculelike?chemicalstructure:twohydrogenatomsandoneoxygenatom.differentpartsofit:aslightlypositiveendandaslightlynegativeend,soitispolar.thefunctionofit:itcauseswatertobeabletodissolvebothsolidsandgases,andthatswhywatercanbreakdownnutrientsquickl

20、y.iii.reflection.thereisacloserelationshipbetweensomepropertiesofwater,forexample,salinity,densityandoceanmotion.howdotheyaffecteachother?2.supposeyouareoneofthemainpropertiesofwater.youthinkyouarethemostimportantandhavethegreatesteffectonlife.trytopersuadeothersbydescribing:1)whatyouare.2)whataffec

21、tsyou.3)whatyouaremadethemostofbyhumanbeings.parttwolisteningi.pre-listeninggiveaverybriefintroductionoftherimeoftheancientmarineranditsauthorsamueltaylorcoleridge.hererimeisthevariantofrhyme.ii.while-listening.listentothestoryandfindtheinformationaboutit.when:18thcentury?where:onashipwho:sailors/ma

22、rinerswhat:oneofthesailorskillsabirdthatbringsgoodlucktotheship,bydoingwhichhehasbroughtbadluckanddeathtothesailors.2.listentopart1forthesecondtimeandfinishthefollowingtrueorfalsequestions.)thispoemwaswrittenbyabritishpoetsamueltaylorcoleridgeinthe1700s.2)inthepoem,oneofthesailorskillsafishunderthes

23、hip.3)itisbelievedthattheanimalhekillsisonethatbringsgoodlucktotheship.4)othersailorsaresofrightenedandangrythattheykillthesailor.5)thesailorsareextremelythirstybuttheycantdrinkthewaterinthesea,becauseitistoodirty.3.listentopart1forthethirdtimeandanswerthefollowingquestions:)whotellsthestoryinthepoe

24、m?2)whatdoesoneofthesailorsdo?3)whatdoyouthinkwillhappennext?4)whyaretheothersailorsfrightened?4.listentopart2andcompletethefollowingsentences.)finallytheydecidethathemustdie_themarinerwho_thebird.2)hemust_itallandwill_byhavingtotellthestory3)_ontheship,_ontheocean,themarinersuffersfrom_and_.4)hisst

25、ory_,the_marinersays_andasksthemtolearnfromhis_.keys:1)except,shot;2)livethrough,pay3)leftalone,drifting,loneliness,fear;4)told,ancient,farewell,sufferings5.listentopart2againandanswerthefollowingquestions:)whathappenstothesailors?2)whathappenstothemariner?3)whyisthepersontellingthestory?4)whoisthep

26、ersonactually?ii.while-listening.reflection:whatdoyoulearnfromthisstory?everythingexistingintheworldhastheirowncertainvalues,weshouldunderstandandrespectthem.2.creationworkwithpartnerandtrytocomeupwithagood,scarystoryliketheoneaboutthemariner.homework.previewintegratingskills“naturesnursery:estuarie

27、s”onpage22period3integratingskillsteachinggoals:.togetstudentstoknowwhatestuariesareandtheirfunctions2.tolearntowriteanexplanationparagraphteachingprocedures:i.lead-inlookatthemapofchina,answerthesequestions:.canyounamethethreecitiesmarkedonthemap?wherearethey?i2.howmuchdoyouknowaboutthem?istheecono

28、mytherewell-developedornot?3.whichcityisthemostdeveloped?why?nowletslookatthismapandthenanswerthefollowingquestions:.canyoutellwhatmapitis?whereisit?2.isthewaterheresaltyorfresh?3.whatstheplacecalledwhereriverandtheoceanmeet?ii.while-reading.skimming)findoutthedefinitionofestuary.2)whatfunctionsofes

29、tuarieshavebeenmentionedinthepassage?3)discussion.whatlivingconditionsdoyouthinkareneededfornaturesyoungones?doestuarieshavesuchconditionsforthem?2.discussionwhatlivingconditionsdoyouthinkareneededfornaturesyoungones?doestuarieshavesuchconditionsforthem?3.scanthepassageandanswerthefollowingquestions

30、.whyareestuariessuchgoodplacesfornaturesyoungones?whatdoes“density”meaninthispassage?howdoestuariesaffectthewaterthatpassesthroughthem?whyareestuariesmoresensitivetopollutionthanotherareas?whyareestuariesimportanttohumanbeings?inestuaries,animalscanenjoyallthebenefitsoftheoceanswithouthavingtofacema

31、nyofitsdangers.tidesprovideenergyfortheecosystems,butestuariesareprotectedfromwavesandstormsbyislands,mudorsand.nutrientsfromboththelandandtheoceanarriveinestuaries.itmeansthedegreetowhichanareaisfilledwiththingsorpeople.theyabsorbnutrientsandpollutantsfromwatercominginlandsources,thuscleaningourwat

32、er.becauseestuariesactasfilters,manypollutantsendupinthem.estuariesprovidebothrecreationandeducationforhumanbeings.forexample,peoplecanfish,swimandhavefunonthebeach;scientistsandstudentshaveendlessopportunitiestostudyavarietyoflifeinthehabitat.estuariesalsocontributetotheeconomythroughtourismandfish

33、ing.4.finishthefollowingpassagewithwordsfromthetext.estuariesarebodiesofwateralongcoaststhatare_whenfreshwaterfromrivers_withsaltwaterfromtheocean.inestuaries,thefreshriverwaterisblockedfromstreamingintotheopenoceanbyeithersurroundingmainland,orislands.thismixingoffreshandsaltwater_auniqueenvironmen

34、t_withlifeofallkinds-azonebetweenthelandandseaknownasanestuary.theestuarygathersandholdsa_oflife-givingnutrientsfromthelandandfromtheocean,forminganecosystemthatcontainsmorecreaturesthananyother_ontheearth.estuariesarealsoimportantforhumanbeings.theyprotectwaterqualityby_pollutantsfromwatercomingfro

35、minlandsources.theyarecentersfor_andeducation.estuaries,inshort,aretreasures.iii.post-readingdiscussionaswelearnfromthispassage,manycitieswhicharebuiltaroundestuaries,likeshanghai,guangzhou,ningbo,shenzhenareverydeveloped.canyouexplainwhy?iv.writingdoyoustillrememberwhatwelearnaboutthepropertiesofwa

36、ter?inthatpassage,thewriterintroducesthechemicalstructureandseveralpropertiesofwatertous,suchassalinity,density,heatcapacity.sofromthisweknowwhenweareexplainingwhatsomethingisorhowthingshappen,itisimportantthatourexplanationsshouldbewellorganizedandeasytounderstand.tiponeifwearedescribingaprocess，we

37、dbetterexplaineachstepintheorderithappens.tellthereadersaboutthecausesandeffectsandusewordslikefirst,second,then,etctoshowtheorderofthesteps.firstsecondthird/thenlasttiptwoifwearewritingaboutsomethingthathasseveralparts,weshoulddescribeeachpartandexplainitsfunctionandstructure.thefollowingquestionsm

38、ayhelp:whatisit?howmanypartsisitmadeupof?whatsthestructureofeachpart?howdoesitwork?homeworkimaginethatyourscienceteacheraskyoutoexplainoneofthefollowingquestions:whydoesanicecubefloat?whatwillhappentoapieceofmetalifyouputitinwater?whydosomanyspeciesliveinestuaries?whyhavesomanycitiesbeenbuiltbyestua

39、ries?chooseoneofthequestionsandwriteapassage,usingwhatyouknowaboutnatureandscienceandwhatyouhavelearnedfromthisunit.period4grammarandwordstudyteachinggoals:toreviewmodalverbs.tomakestudentsgetmorefamiliarwiththemodalandpractiseusingthemindifferentsituations.toenablestudentstomastersomenewwordsandexp

40、ressions.teachingprocedures:partone:grammarmodalverbsrevisionwehavetalkedaboutthepropertiesofwaterandweknowthatwatercanbeusedinmanywaysduetotheseproperties.sopleaseanswerthefollowingquestions.whatarethesepropertiesofwater?canyougivesomemoreexamplesthatshowwecanbenefitfromthesepropertiesofwater?accor

41、dingtotheabovediscussion,weknowthatthesepropertiesofwaterareveryimportantandhelpusalot.justbecauseofthesepropertiesofwater,watercanmeetpeoplesneedsoflivingontheearth.wecansaythatwateristhe“l(fā)ifefood”oftheearth.itisanecessityofhumanbeingsandalltheotherlivingthings.however,haveyoueverimaginedthefollowi

42、ngsituations?ii.presentationwithoutoceanmotion,whatwouldtheearthbelike?ifthedensityoficewerelargerthanthatofwater,whatwouldtheseabedbelike?supposewaterhadamuchlowerfreezingpoint,whatwouldtheworldbelike?iii.trytolistsomemodalverbsaccordingtotheirfunctions.possibilitycertaintyabilitypermissionrequests

43、uggestionsnecessityadviceiv.moresituationsgiventopracticeusingmodalverbs.situationone:asmanyas7billionpeoplethroughouttheworldcouldfaceawatershortageby2050ifthepresentsituationcontinues.bythen,theglobalpopulationisexpectedtoreach9.3billion.manybigcities,includingbeijing,shanghaiandtianjin,willsuffer

44、severewatershortages.)ifitistrue,whatmayhappeninthefuture?2)whatcanourcountrydowiththisproblem?3)whatshouldwedoinourdailylife?situationtwo:threegorgesprojectisthelargestwaterconservancyprojecteverbuiltinthewater.itissaidthatthewholeprojectwillbecompletedintheyearxxasplanned.sotrytodiscussthefollowingquestions:)iftheprojectiscompletedintheyearxx,whatadvantageswillitbringtous?2)iftheprojectiscompletedintheyearxx,whatproblemsmayitcause?howcanwedealwiththeseproblems?whatshouldwedotosolvetheseproblems?v.consolidati