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Unit13Integratingskills人教版高二英语Unit13Thewaterplanet单元完整课件人教版高二英语Unit13Thewaterplanet单元完整课件.ppt

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SkimmingGreatplacesfornature’syounganimals. Cleanourwaterbyabsorbingnutrientsandpollutantsfromwatercomingfrominlandsources; Providebothrecreationand educationforhumanbeings.1.Whyareestuariessuchgoodplacesfornature’syoungones? Inestuaries,animalscanenjoyallthebenefitsoftheoceanswithouthavingtofacemanyofitsdangers. Tidesprovideenergyfortheecosystems,butestuariesareprotectedfromwavesandstormsbyislands,mudorsand. Nutrientsfromboththelandandtheoceanarriveinestuaries.4.Whyareestuariesmoresensitivetopollutionthanotherareas? Becauseestuariesactasfilters(过滤器),manypollutantsendupinthem.5.Whyareestuariesimportanttohumanbeings? Estuariesprovidebothrecreationandeducationforhumanbeings. Peoplecanfish,swimandhavefunonthebeach. Scientistsandstudentshaveendlessopportunitiestostudyavarietyoflifeinthehabitat. Estuariesalsocontributetotheeconomythroughtourismandfishing.Estuariesarebodiesofwateralongcoaststhatare________(形成)whenfreshwaterfromriversflowsintoand________withsaltwaterfromtheocean.Inestuaries,thefreshriverwaterisblockedfromstreamingintotheopenoceanbyeithersurroundingmainland,orislands.Thismixingoffreshandsaltwater_______auniqueenvironment______withlifeofallkinds—azonebetweenthelandandseaknownasanestuary.Theestuarygathersandholdsa________oflife－givingnutrientsfromthelandandfromtheocean,forminganecosystemthatcontainsmorecreaturesthananyother________ontheearth.Estuariesarealsoimportantforhumanbeings.Theyprotectwaterqualityby________pollutantsfromwatercomingfrominlandsources.Theyarecentersfor________________(娱乐)andeducation.Estuaries,inshort,aretreasures.WritingIfyouaredescribingaprocess, Youshouldexplaineachstepintheorderithappens. Tellthereadersaboutthecausesandeffectsandusewordslikefirst,second,then,etctoshowtheorderofthesteps.Ifyouarewritingaboutsomethingthathasseveralparts,describeeachpartandexplainitsfunctionandstructure. Thefollowingquestionsmayhelp: Whatisit?Howmanypartsisitmadeupof? What‘sthestructureofeachpart?Howdoesitwork? What’sthefunctionofthething?书面表达 现在越来越多的人购买小