人教修订版高二下 unit 13 reading课件.ppt

Unit13Thewaterplanet,READING:THEPROPERTIESOFWATER,PRE-READING,Activity1.Structureofthepassage,A:1minutetoskimthepassage,focusingonthetitles(titleandsubtitles)inthetextandthenfillinthechartbelow.Youdonotneedtoreadthewholetext.,THEPROPERTIESOFWATER,CHEMICALSTRUCTURE,SALINITY,DENSITY,HEATCAPACITY,OCEANMOTION,B:Usethetopicofeachparagraphandthestructureabovetomakesixquestions.Workingroupsandfillinthequestions.Writedownyouranswersandanythingelseyouknowaboutthetopic.,Activity2.WordStudy,A:Lookatthetitlesofthereading.Whichofthefollowingwordsdoyouthinkwillbeinthereadingpassagewhenwetalkaboutthistopic.,range,sensitive,decrease,absorb,freezing,float,stable,dissolve,range:tovarywithinspecifiedlimitsfreezing:dissolve:toreduce(solidmatter)toliquidform;meltfloat:tocausetoremainsuspendedwithoutsinkingorfallingdecrease:togroworcausetogrowgraduallylessorsmaller,asinnumber,amountabsorb:totakesomethinginstable:resistanttochangeofpositionorconditionsensitive:responsivetoexternalconditionsorstimulation,B:Lookatthewordsbelowandputthemintothecorrectcolumn.Youmayrefertothe“Vocabulary”partinthebook.,C:Wordstudy,P201.Thelettersofthefollowingwordshavebeenmixedup.Putthelettersinthecorrectorder.,atom,unique,solid,absorb,centigrade,pure,hydrogen,oxygen,mass,float,TopicSentenceofthetext:Paragraph:_Sentence:,TopicSentenceofSALINITY:Paragraph:_Sentence:,TopicSentenceofCHEMICALSTRUCTURE:Paragraph:_Sentence:,Activity3.FindingTopicSentences,7,3,2,Learningaboutthepropertiesofwaterhelpsusunderstandlifeonourplanet.,Thechemicalstructureofwatermakesitanexcellentmediumforlife.,Thesalinityoftheearthsoceansisaboutthirty-fivepartsperthousand,meaningthatthereareaboutthirty-fivegrammesofdissolvedsolidsandgasesinonekilogrammeofwater.,READING:,TopicSentenceofHEATCAPACITY:Paragraph:_Sentence:,TopicSentenceofDENSITY:Paragraph:_Sentence:,4,Thedensityofpurewateris1,000kg/m3,meaningthatonecubicmetreofwaterweighsonethousandkilogrammes.,5,Heatcapacityisthemountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade.,TopicSentenceofOCEANMOTION:Paragraph:_Sentence:,6,Sincechangesinsalinityandtemperatureaffectwatersdensity,thewaterintheoceanisalwaysmoving.,incredibly:unbelievablydoubtfullyextremelyquestionably,Activity4.ComprehensionA,Paragraph1.marinelife:(definitionbasedonthetext),Ninety-ninepercentofthelivingspaceonearthisintheoceans.,Lifeintheoceansrangesfromthetiniestplanktonallthewayuptogiantslikesharksandwhales.(paraphrase),_,Normalstateofwater:solidliquidgas,negativeend:+,positiveend:+,polar:+,medium:averagechannelmeanscondition,Paragraph2.H2O:2_+1_=1_,HydrogenAtoms,OxygenAtom,H2OMolecule,Whyisthechemicalstructureofwaterimportant?,1.Becausewaterispolar,itcanbreakdownbothsolidsandgases.2.Thenutrientsinwhateverfallsintotheoceanquicklybecomeavailabletootherlivingcreatures.3.Thechemicalstructureofwateralsomakesitdifferentfromalmosteverythingelseonearth.,Thenutrientsinwhateverfallsintotheoceanquicklybecomeavailabletootherlivingcreatures.(paraphrase)_,salinityofseawater:3535%,Paragraph3.seawater(saltwater)=_+_+_salinityofseawateraffects:_and_,dissolvedgases,dissolvedsolids,purewater,weight,freezingpoint,Paragraph4.Factorsofdensity:_and_Unitofdensity:_=_Densityofpurewater:_=_Whenwaterfreezes,itsdensitydecreases.Ifitdidnot,theoceanswouldbefrozensolid.(paraphrase)_,mass,volume,kg/m3,kilogrammespercubicmetre,1,000kg/m3,onecubicmetreofwaterweighsonethousandkilogrammes,Oppositeword/phraseofabsorb:giveoffchangecreate,Heatcapacity:watertemperaturesubstancenergy,Paragraph5.,Paragraph6.Howdoesthewaterintheoceanmove?,Paragraph7.Mainidea:_Water,whichseemssosimpleandcommon,iswhatmakeslifepossible.Ofalltheresourcesonearth-oil,gas,goldandsoon-nothingisaspreciousasadropofrain.(paraphrase)_,significanceofwatertonature,Densewatersinksandlessdensewaterispushedtothesurface.,POST-READING,Activity4.ComprehensionB,Completethechartbelow.P21,1Thewatermoleculeismadeupoftwoh_atomsandoneo_atom.2Waterisaliquidatroomtemperature,butitturnsintoas_whenthetemperaturedropsbelow0andintoagaswhenheatedabove100.3Thesoilcana_water,soithelpstokeepwaterfromflowingaway.4Marinescientistsstudyther_betweenlivingcreaturesandtheirhabitatintheocean.5Lifeintheoceansappearsindifferentsizes,r_fromthetiniestfishallthewayuptothebiggestbluewhales.6Oilhasadensitylowerthan1,000kg/m3,soitwillf_onwater.,Activity5.LanguageStudy,WordstudyP212Fillintheblankswiththeproperwords.Thefirstletterhasbeengiven.,solid,absorb,hydrogen,oxygen,float,relationship,ranging,Activity6.Summary,FeaturesofScienceExposition：,A.SentenceStructure:B.Vocabulary:C.Tense:D.TextStructure:,INTEGRATINGSKILLS,READING:NATURESNURSERY:ESTUARIES,Activity1.FindingTopicSentences,TopicSentenceofParagraph:_Sentence:,Astheoceansarethesourceoflifeonearth,theestuariesareourplanetsnurseries.,TopicSentenceofParagraph:_Sentence:,Estuariesaregreatplacesfornaturesyoungones.,TopicSentenceofParagraph:_Sentence:,Estuariesarealsoimportantbecausetheyabsorbnutrientsandpollutantsfromwatercomingfrominlandsources,thuscleaningourwater.,TopicSentenceofParagraph:_Sentence:,Estuariesprovidebothrecreationandeducationforhumanbeings.,3,2,4,1,Activity2.Structureofthepassage,1,2,4,3,1,2,4,3,1,2,3,4,Activity3.Answeringthequestions,1Whyareestuariessuchgoodplacesfornaturesyoungones?2Whatdoesdensitymeaninthispassage?3Howdoestuariesaffectthewaterthatpassesthroughthem?4Whyareestuariesmoresensitivetopollutionthanotherareas?5Whyareestuariesimportanttohumanbeings?,Activity4.WordStudy,thebodyofwaterwherearivermeetstheoceanb.warm-bloodedvertebrateanimalstogenerate(offspring)bysexualorasexualmeans.somethingthatpollutes,especiallyawastemateriale.theprocessoferodingortheconditionofbeingerodedf.refreshmentofonesmindorbodyafterworkthroughactivitythatamusesorstimulates,pollutantestuaryrecreationmammalreproduceerosion,ProvideforThecompanywillprovidefoodanddrinkforthem.2.HaveanopportunitytodoIhaveanopportunitytodiscusstheproblemwithheryesterday.3.AvarietyofHeleftforavarietyofreasons.Thereareavarietyofpatternsforyoutochoosefrom.,deepad