Unit 13 The Water Planet教案.docx

Unit 13 The Water Planet教案.docx

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Unit13TheWaterPlanet教案

Unit13TheWaterPlanet教案

Unit13TheWaterPlanetPeriod1ReadingTeachinggoals:

1.TogettheSstounderstandthemainpropertiesofwaterbyconnectingthemwithsomecommonphenomenaandlearningtoexplainthephenomena.2.Toenablethemtobeawareoftheimportanceofwater,makinggooduseofwaterinaproperwayandprotectingwaterresources.Teachingsteps:

Step1:

LeadinReadashortpoemandguessitsname:

Aletterfrom_______.（Water）DearUser,Shametoyouall,theIgnorant,IamyourlifeButyouseemnottovaluemeGivemealltherespectForinmeiseternallifeIfyoucontinueabusingmeSurely,allformsoflifewillwitherawayHaveyoueverimagined,Lifewithoutme?

Itellyou,itwillbeunbearableThinktwiceForeverydropcounts...Qs:

1）Whatdoes“Dearuser”herereferto?

2）Whatdoesittalktoitsusers?

3）Onwhichplanetdoesitexist?

－Ontheearth,whichisalsocalledthewaterplanet.4）Doyouknowwhyitiscalled“Thewaterplanet”?

－Becauseaboutthreequartersoftheearthiscoveredbywater.Step2:

Pre-readingLookatthetitlesinthetextbelow.Donotreadthewholetext.Pickoutthesubjectofeachparagraph.Usethestructuresbelowtomakesixquestionsrelatedtothesubjects.（P.19）Step3:

Whilereading:

1.Skimtofindbasicfactsaboutlifeintheoceansfromtheopeningparagraph:

Lifeonearthbeganintheoceansaboutthreebillionyearsago;99%ofthelivingspaceonearthisintheoceans;Thereareaboutfivemillion（known）speciesintheoceans;Lifeintheoceansrangesfromtinyplanktontogiantwhales.2．Quiz:

Trueorfalsequestions:

1）Waterisaliquidatroomtemperature,andithasarelativelyhighfreezingpoint.2）Thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.3）Likealltheothersubstances,watergetssmaller（contract缩小）whenitfreezes.4）Purewaterhasahigherfreezingpointandlighterthansaltwater.5）Thesalinityoftheearth’soceansisabout3.5%.6）Whenwaterfreezes,itsdensityincreases.7）Otherrecoursessuchasoil,gas,goldetcisaspreciousasadropofrain.8）Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.（billion---million）9）Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.10）Purewaterhasahigherfreezingpointandislighterthansaltwater.（madeof---madeupof）11）Ifasubstancehasadensity888kg/m3,itwillfloatonWater.12）Theheatcapacityisrelativelyhigh,sothatmostanimalsdon’tlikelivinginit.（temperaturestable----like）13）Themostimportantthingwecanlearnaboutwater,isthatwemustprotectitanduseitwisely.（TFFFFTTFFTTFT）3.Multiplechoices:

（A）1.BasedonPara.I,theauthortellsusthattherearevariousspeciesintheoceans,indicatingthat____.A.Waterplaysagreatroleformarinelife.B.Oceanisagoodplaceforlife.C.TherearemanyreasonsfortiniestplanktonandgiantslikesharksandwhalesD.Oceanispartoftheearth（C）2.Thewaterintheoceanisalwaysmovinginthat_____.A.Thetemperatureofseawaterisrelativelyhigh.B.Water’sdensityaffectchangesinsalinityandtemperature.C.Changesinsalinityandtemperaturehaveeffectonwater’sdensity.D.Watersinriversalwaysflowintotheocean.（D）3.Generallyspeaking,humanbeingsare______tolargeorsuddenlychangesintemperature.A.generousB.objectiveC.subjectiveD.sensitive4.Canyouanswerthefollowingquestions?

1）Whatistheimportanceofthechemicalstructureofwater?

Thechemicalstructureofwatermakesitanexcellentmediumforlifeandalsomakesitdifferentfromalmosteverythingelseonearth.2）Whatisthesalinityoftheearth’soceans?

Thesalinityoftheearth’soceansisaboutthirty-fivepartsperthousand,meanigthatthereareabout35grammesofdissolvedsolidsandgasesinonekilogrammeofwater.3）Howaboutdensityandheatcapacity?

Densityistherelationshipbetweenmassandvolume,measuredinkilogrammespercubicmetre.Heatcapacitytheamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade.5.Furtherunderstandingbylookingatsomepictures:

Readfollowingstatementandthinkwhatconclusionyoucandraw?

Orwhatpropertydoesitreferto?

Itissaidthatamanof60kglosesabout1Lwaterthroughbreathandskinevaporation（皮肤蒸发）everyday.Inotherwords,539kcalheatisreleasedinthesetwoways.Ifsomuchheatwerekeptinhumanbody,itwouldraisebodytemperatureby9℃.Canyouimaginetheresult?

Waterhasarelativelyhighheatcapacityandcanaccommodatetheclimateautomatically.Itcanabsorbandreleasealotofheatwithoutbigchangesinitstemperature,thuscreatingastableenvironment.Herearesomemorefamiliarphenomena,whatpropertyofwateraretheyrelatedto?

Thecoastalareasareoftenneithertoohotnortoocold.Icefloatsonwater.Whentheseawaterinacontainerisevaporated（蒸发）,therewillbesomesaltleft.Irrigateinwintercanhelpraisethesoiltemperature.PeopleswimmingintheDeadSeafloat;theycanevenreadapaperwhilelyingontheirbackinthewater.Discussion:

Inthepassagemanypropertieshavebeentalkedabout.Arethereanyotherpropertiesyouthinkimportantnotmentioned?

Homework:

Trytothinkasmanyexamplesaspossibletoshowthatwaterismadeuseoftobringbenefittohumanbeings.

Period2Post-reading&ListeningTeachinggoals:

1.Togetstudentshaveabetterunderstandingofwater.2.Tolearnsomenewwordsandsentencestructures.Teachingprocedures:

PartonePost-readingI.Betterunderstandthepropertiesofwater1.“Wherethereiswater,thereislife!

”Canyouusesomefactstoillustrateit?

－Waterisamediumforlife.Sofarasweknow,lifeonlyexistsonearth,becausethereiswater.Etc.2.Ourplanetisawaterplanetofwhichtwothirdsofitssurfaceiscoveredbywater.What’smore,ourbodyisalsomainlycomposedofwater.Doyouknowfollowingfigureswhichshowhowmuchwaterthereisinpartsofourbody?

60%,70%,82%,90%Upto_____ofthehumanbodyiswater.______ofthebrainiscomposedofwater.______bloodismadeupofwater.Thelungsarenearly_____water.3.Wateristhesourceoflife.That’swhywaterisanexcellentmediumforlife.Andyouknowallthisisbecauseofwater’suniqueproperties.II.Revisiononthepropertiesofwater1.Whatarethepropertiesofwater?

Waterispolar.Waterisliquidatroomtemperature.Waterhasarelativelyhighfreezingpoint.Waterhasdensity1,000kg/m3.Waterhashighheatcapacity.…2.Whatcauseswatertohavesuchuniqueproperties?

－It’smoleculeform/chemicalstructure.3.Whatiswatermoleculelike?

Chemicalstructure:

twohydrogenatomsandoneoxygenatom.Differentpartsofit:

aslightlypositiveendandaslightlynegativeend,soitispolar.Thefunctionofit:

itcauseswatertobeabletodissolvebothsolidsandgases,andthat’swhywatercanbreakdownnutrientsquickly.III.Reflection1.Thereisacloserelationshipbetweensomepropertiesofwater,forexample,salinity,densityandoceanmotion.Howdotheyaffecteachother?

2.Supposeyouareoneofthemainpropertiesofwater（resolvability,salinity,density…）.Youthinkyouarethemostimportantandhavethegreatesteffectonlife.Trytopersuadeothersbydescribing:

1）Whatyouare.2）Whataffectsyou.3）Whatyouaremadethemostofbyhumanbeings.ParttwoListeningI.Pre-listeningGiveaverybriefintroductionofTheRimeoftheAncientMarineranditsauthorSamuelTaylorColeridge.Hererimeisthevariantofrhyme.II.While-listening1.Listentothestory（Part1）andfindtheinformationaboutit.（When,where,who,what?

）When:

18thcentury?

（No,notmentioned）Where:

onashipWho:

sailors/marinersWhat:

Oneofthesailorskillsabirdthatbringsgoodlucktotheship,bydoingwhichhehasbroughtbadluckanddeathtothesailors.2.Listentopart1forthesecondtimeandfinishthefollowingtrueorfalsequestions.1）ThispoemwaswrittenbyaBritishpoetSamuelTaylorColeridgeinthe1700s.2）Inthepoem,oneofthesailorskillsafishundertheship.3）Itisbelievedthattheanimalhekillsisonethatbringsgoodlucktotheship.4）Othersailorsaresofrightenedandangrythattheykillthesailor.5）Thesailorsareextremelythirstybuttheycan’tdrinkthewaterinthesea,becauseitistoodirty.（Keys:

TFTFF）3.Listentopart1forthethirdtimeandanswerthefollowingquestions:

1）Whotellsthestoryinthepoem?

2）Whatdoesoneofthesailorsdo?

3）Whatdoyouthinkwillhappennext?

4）Whyaretheothersailorsfrightened?

4.Listentopart2andcompletethefollowingsentences.1）Finallytheydecidethathemustdie－_______themarinerwho_______thebird.2）Hemust____________itallandwill______byhavingtotellthestory…3）___________ontheship,_________ontheocean,themarinersuffersfrom__________and______.4）Hisstory_____,the________marinersays_________andasksthemtolearnfromhis___________.Keys:

1）except,shot;2）livethrough,pay3）Leftalone,drifting,loneliness,fear;4）told,ancient,farewell,sufferings5.Listentopart2againandanswerthefollowingquestions:

1）Whathappenstothesailors?

2）Whathappenstothemariner?

3）Whyisthepersontellingthestory?

4）Whoisthepersonactually?

II.While-listening1.Reflection:

Whatdoyoulearnfromthisstory?

－Everythingexistingintheworldhastheirowncertainvalues,weshouldunderstandandrespectthem.2.CreationWorkwithpartnerandtrytocomeupwithagood,scarystoryliketheoneaboutthemariner.Homework1.PreviewIntegratingSkills“Nature’s