人教版英语高二13单元课件.ppt

,人教修订版高中二年级(下)Unit13,Reading,河北石改花,ThePropertiesofWater,Whatiswatermadeupof?,Themoleculeofwaterismadeupoftwohydrogenatomsandoneoxygenatom.,Whatpropertiesorcharacteristicsdoyouknowaboutwater?,properties,Whatpropertyofwaterdoeseachofthefourexperimentsillustrate?Whatcausesthisphenomenon?Whatsthisphenomenonrelatedto?,Groupwork,Thepaperwontfalloff.Becausetheairpressurecanholdthepaperandthewaterwontflowout.,Thewaterandtheoilwontmix.Theoilfloatsonthewater.Itisbecausethedensitiesofthemaredifferent.Waterhaslargerdensityandmass.,Thechalkwilldissolveinthewater.Itisbecausewaterhastheabilitytodissolvethesoluble(可溶解的)thingsandmatters.,Theicecubefloatsonbothsaltwaterandfreshwater,buticedissolvesfasterinsaltwater.Becauseicehassmallerdensityanditcanfloatonthefreshwaterandsaltcanhelpdissolve.,Pre-reading,Predictwhatthetextisaboutbyreadingonlythetitleofeachparagraph.Whatare_?Whatdo_looklike?,thepropertiesofwater,thepropertiesofwater,Whataredifferentpartsof_?Whatcan_becomparedto?Howdo_work?Whataresomeexamplesoflife_?,theoceans,theoceans,theoceans,intheocean,While-reading,Thepropertiesofwater,OceanMotion,HeatCapacity,Salinity,ChemicalStructure,Density,TrueorFalse,1.Waterisaliquidatroomtemperature,andithasarelativelyhighfreezingpoint.2.Thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.,T,F,3.Likealltheothersubstances,watergetssmallerwhenitfreezes.4.Purewaterhasahigherfreezingpointandlighterthansaltwater.5.Thesalinityoftheearthsoceansisabout3.5%.6.Whenwaterfreezes,itsdensityincreases.,T,T,F,F,7.Otherrecoursessuchasoil,gas,goldetc.isaspreciousasadropofrain.8.Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.,F,F,9.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.10.Purewaterhasahigherfreezingpointandislighterthansaltwater.11.Ifasubstancehasadensity888kg/m3,itwillfloatonWater.,T,T,T,12.Theheatcapacityofwaterisrelativelyhigh,sothatmostanimalsdontlikelivinginit.13.Themostimportantthingwecanlearnaboutwater,isthatwemustprotectitanduseitwisely.,F,T,Multiplechoices,1.BasedonPara.I,theauthortellsusthattherearevariousspeciesintheoceans,indicatingthat_.Waterplaysagreatroleformarinelife.,B.Oceanisagoodplaceforlife.C.Therearemanyreasonsfortiniestplanktonandgiantslikesharksandwhales.D.Oceanispartoftheearth.,A,2.Thewaterintheoceanisalwaysmovinginthat_.A.Thetemperatureofseawaterisrelativelyhigh.B.Watersdensityaffectchangesinsalinityandtemperature.,C.Changesinsalinityandtemperaturehaveeffectonwatersdensity.D.Watersinriversalwaysflowintotheocean.,C,3.Generallyspeaking,humanbeingsare_tolargeorsuddenlychangesintemperature.A.generousB.objectiveC.subjectiveD.sensitive,D,Answerthefollowingquestions,1.Whatistheimportanceofthechemicalstructureofwater?,Thechemicalstructureofwatermakesitanexcellentmediumforlifeandalsomakesitdifferentfromalmosteverythingelseonearth.,2.Whatisthesalinityoftheearthsoceans?,Thesalinityoftheearthsoceansisaboutthirty-fivepartsperthousand,meaningthatthereareabout35grammesofdissolvedsolidsandgasesinonekilogrammeofwater.,3.Howaboutdensityandheatcapacity?,Densityistherelationshipbetweenmassandvolume,measuredinkilogrammespercubicmetre.Heatcapacityistheamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade.,Languagepoints,1.rangefromto:varyinaspecifiedlimitse.g.Thetemperatureshererangefrom10to30C.这儿的气温变化在10度至30度之间,2.allthewaye.g.MrsWangcameallthewayhere.王夫人径直到这儿来了。3.makesitanexcellentmediummake+n.+n.e.g.Iwanttomakemysisterapianist.我想使我的妹妹成为一个钢琴家。,注意：可跟名词做宾补的英语动词并不多。常见的有：name；call；elect；choose等。e.g.Wechosehimchairmanoftheimportantmeeting.,4.makeitdifferentfrommakeit+adj.e.g.Youmustmakeitclearthatwhyyouarelateforschool.你必须讲清楚你迟到的原因,5.ismadeupofe.g.Thewatermoleculeismadeupoftwohydrogenatomsandoneoxygenatom.6.breakdown:分解,分化e.g.Chemicalsinthebodybreakourfooddownintousefulsubstances.人体中的化学元素把食物分解成有用的物质。,7.mix.with:把和混起来mixjoywithsorrow悲喜交集8.affect:影响;使感染e.g.Smokingaffectshealth.9.freezing:adj.极冷的frozen:adj.已经结冰的afreezingglance冷淡的一瞥befreezingcold冰冻一样地冷,10.mass:quality(质量)themasses群众,民众e.g.Themasseshaveboundlesscreativepower.amassof大量的e.g.Beforetherain,theskywasamassofclouds.,11.ismeasuredinmeasurev.e.g.Whetheragirlisbeautifulornotismeasuredbyhersoul.measuren.e.g.Kilogrammeisthemeasureofweight.,12.absorb:takeine.g.Theiceabsorbsheatandturnsintowater.absorbonesattention=drawonesattentionbeabsorbedin13.stable:balancedastablerelationship稳定的关系astableman一个稳重的人,14.sensitive:对.敏感besensitivetoe.g.Youshouldbesensitivetothechangeofthesociety.15.steady:平稳的;稳固的;稳定的besteadyinonespurpose意志坚定的,e.g.Ifyouaresteadyinyourpurpose,yourdreamwillcometrue.makesteadyprogress取得持续进步asteadyman一个稳重的人16.addto:把加到上/里addfueltotheflame火上加油addupto总共,Thewatermoleculeismadeupoftwohydrogenatomsandoneoxygenatom.Thewatermoleculeispolarithasaslightlynegativeandaslightlypositiveend.,Post-reading,Becausewaterispolar,itbreaksdownnutrientsquickly.Thechemicalstructureofwateralsomakesitdifferentfrommostothersubstances:itisaliquidatroomtemperatureandhasarelativelyhighfreezingpoint.,Densityistherelationshipbetweenmassandvolume.,Thedensityofwaterhelpssmallcreaturesfloat.Becausethedensityofwaterdecreaseswhenitfreezes,theoceansneverfreezetotally.,Heatcapacityistheamountofenergyittakestoraisethetemperatureofasubstanceonedegreecentigrade.,Theheatcapa