高二英语Unit13 reading 人教版 课件VIP免费

ReadingReadingThePropertiesofWaterWhatpropertiesorcharacteristicsdoWhatpropertiesorcharacteristicsdoyouknowaboutwater?youknowaboutwater?colorlesstastelesshavingnofixedshapethreeformsfeelingwetkeepinglevel?absorbingheatpropertiespropertiespropertiespropertiesWateristhesourceoflife.We’llknowabout:We’llknowabout:ThepropertiesofwaterThepropertiesofwaterOceanMotionOceanMotionHeatCapacityHeatCapacitySalinitySalinityChemicalStructureChemicalStructureDensityDensityWhatiswatermadeupof?Themoleculeofwaterismadeupoftwohydrogenatomsandoneoxygenatom.Scanandanswerthefollowingquestions:1.Whatistheimportanceofthechemicalstructureofwater?Thechemicalstructureofwatermakesitanexcellentmediumforlifeandalsomakesitdifferentfromalmosteverythingelseonearth.2.Whatisthesalinityoftheearth’soceans?Thesalinityoftheearth’soceansisaboutthirty-fivepartsperthousand,meanigthatthereareabout35grammesofdissolvedsolidsandgasesinonekilogrammeofwater.3.Howaboutdensityandheatcapacity?Densityistherelationshipbetweenmassandvolume,measuredinkilogrammespercubicmetre.Heatcapacityistheamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade.ListencarefullyanddecideTrueorFalseListencarefullyanddecideTrueorFalse1.Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.2.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.FTFT3.Thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity.4.Thesalinityoftheearth’soceansisabout3.5%.5.Likealltheothersubstances,watergetssmallerwhenitfreezes.6.Whenwaterfreezes,itsdensityincreases.FF7.Purewaterhasahigherfreezingpointandlighterthansaltwater.8.Ifasubstancehasadensity888kg/m3,itwillfloatonwater.9.Theheatcapacityofwaterisrelativelyhigh,sothatmostanimalsdon’tlikelivinginit.TTF10.Otherrecoursessuchasoil,gas,goldetcisaspreciousasadropofrain.F11.Themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely.TMultiplechoices1.Whatmakeswateranexcellentmediumforlife?A.Itsweightandfreezingpoint.B.Itsdensity.C.Itscapacity.D.Itschemicalstructure.D2.Thewaterintheoceanisalwaysmovingbecause___.A.thetemperatureofseawaterisrelativelyhigh.B.water’sdensityaffectchangesinsalinityandtemperature.C.changesinsalinityandtemperaturehaveeffectonwater’sdensity.D.watersinriversalwaysflowintotheocean.C3.Generallyspeaking,humanbeingsare______tolargeorsuddenlychangesintemperature.A.generousB.objectiveC.subjectiveD.sensitiveDLanguagepointsLanguagepoints1.Yet(否定句)还，尚At2o’clock,theyhadnotdecidedwhethertogoornot.(问)已经Hashecomeyet?Wehavealreadybeenreadynow.(肯定句，已经)（肯）仍然，还得Heisyetachild.Thebestisyettocome.最好的还在后头2.rangefrom…to…:varyinaspecifiedlimitse.g.Thetemperatureshererangefrom10to30°C.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.…makesitanexcellentmedium…make+n.+n.e.g.Iwanttomakemysisterapianist.我想使我的妹妹成为一个钢琴家。4.…makeitdifferentfrom…makeit+adj.…e.g.Youmustmakeitclearthatwhyyouarelateforschool.你必须讲清楚你迟到的原因5.…ismadeupof…e.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.Smokingaffectshealt...