高中英语 unit13 The Water Planit课件 新人教版.ppt

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1、Whyisitblue?WaterPlanetWhatcanwaterbeusedfor?drinkWashclothesirrigationtransportprovidelivingspaceformarinelifeTheyarefloatingonthesurfaceofDeadSea.Canyouexplainhowtheycandothis?entertainmentpropertiesWhatpropertiesorcharacteristicsdoyouknowaboutwater?colorlesstastelessodorlessthreeformsfeel

2、ingwetabsorbingheatdissolving1.Whatelsehaveyoulearnedaboutwaterandthewaterplanet?3.Doyouknowanypropertiesofwater?2.Whatwouldhappeniftherewerenowateronourplanet?Activity1.Structureofthepassage1minutetoskimthepassageandfillinthechartbelow.Youdonotneedtoreadthewholetext.Thepropertiesofwaterchem

3、icalstructuresalinitydensityheatcapacityoceanmotionCarefulReading______________percentofthelivingspaceonearthisintheoceans.Thereareabout_______________speciesintheoceans.Marinelifeisincrediblyrichandvaried.Paragraph1Ninety-ninefivemillion海洋生物数量之大，种类之多，简直难以置信Lifeintheoceansrangesfromthetinies

4、tplanktonallthewayuptogiantslikesharksandwhales.rangefrom…to/rangebetween…and…__从…到..之间变化___N:范围，射程awiderangeofinterestsandhobbiesWhatistherangeofthegun?海洋里的生物从微小的浮游生物到巨大动物，如鲨鱼和鲸鱼，都无所不包。Normalstateofwater:solidliquidgasnegativeend:+–↑↓positiveend:+–↑↓polar:+–↑↓medium:averagechannelmeanscondi

5、tionH2O:2_______________+1____________=1___________HydrogenAtomsOxygenAtomH2OMolecule√√√√√√Paragraph2Water’suniquechemicalstructureOxygenAtomHydrogenAtomapolar(adj.极性的)moleculeButthewaythewatermoleculeisformedgiveswateritsuniqueproperties但是水分子的结构方式赋予了水独特的性质。Becausewaterispolar,itcanbreakboth

6、solidsandgases.因为水是极性的，所以它能够分解固体和气体。Thenutrientsinwhateverfallsintotheoceanquicklybecomeavailabletootherlivingcreatures.任何落入海洋的东西其所含的营养物质都能很快被其他生物所利用。（宾语从句）seawater(saltwater)=________________+________________+___________salinityofseawateraffects:___________and______________Saltwaterhasa____

7、___freezingpointandis_______thanpurewater.salinityofseawater:35‰35%√dissolvedgasesdissolvedsolidspurewaterweightfreezingpointparagraph3lowerheavierthepurewateriswhatgivesseawateritsmainproperties，是纯水赋予了海水的主要特征Thesalinityoftheearth’soceansisaboutthi