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人教版高二英语Unit13 Reading 课件.ppt

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ReadingWhatiswatermadeupof?Whatpropertiesorcharacteristicsdoyouknowaboutwater?Thepaperwon’tfalloff.Becausetheairpressurecanholdthepaperandthewaterwon’tflowout.Thewaterandtheoilwon’tmix.Theoilfloatsonthewater.Itisbecausethedensitiesofthemaredifferent.Waterhaslargerdensityandmass.Thechalkwilldissolveinthewater.Itisbecausewaterhastheabilitytodissolvethesoluble(可溶解的)thingsandmatters.Theicecubefloatsonbothsaltwaterandfreshwaterbuticedissolvesfasterinsaltwater.Becauseicehassmallerdensityanditcanfloatonthefreshwaterandsaltcanhelpdissolve.Pre-readingWhataredifferentpartsof_________?Whatcan_________becomparedto?Howdo_________work?Whataresomeexamplesoflife__________?TrueorFalse3.Likealltheothersubstanceswatergetssmallerwhenitfreezes.4.Purewaterhasahigherfreezingpointandlighterthansaltwater.5.Thesalinityoftheearth’soceansisabout3.5%.6.Whenwaterfreezesitsdensityincreases.7.Otherrecoursessuchasoilgasgoldetcisaspreciousasadropofrain.8.Thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales.9.Thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom.10.Purewaterhasahigherfreezingpointandislighterthansaltwater.11.Ifasubstancehasadensity888kg/m3itwillfloatonWater.12.Theheatcapacityisrelativelyhighsothatmostanimalsdon’tlikelivinginit.13.Themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely.MultiplechoicesB.Oceanisagoodplaceforlife.C.Therearemanyreasonsfortiniestplanktonandgiantslikesharksandwhales.D.Oceanispartoftheearth.2.Thewaterintheoceanisalwaysmovinginthat___.A.Thetemperatureofseawaterisrelativelyhigh.B.Water’sdensityaffectchanges