U13warmingup,listeningandspeakingSEFC课件

GuesstheriddleIt’sveryimportanttoalltheanimalsandplantsIt’salsoimportanttohumanbeingsIt’sliquidatroomtemperatureEverydayyoukeepintouchwithitYoucan’tlivewithoutit(athing)T:What’sit?CollectasmanywordsaspossiblerelatedtowaterwaterriverlakeoceanfishsweaticesteamrainpropertiesWhatpropertiesorcharacteristicsdoyouknowaboutwater?colorlesstastelessodorlessthreeformsfeelingwetabsorbingheatdissolvingWhatpropertyofwaterdoeseachofthefourexperimentsillustrate?Whatcausesthisphenomenon?What’sthisphenomenonrelatedto?Experiments12341Experiment1showshowairpressurecausesapieceofthickpapertocling(粘着）toanupturnedglassofwater1Experiment2illustrates（说明）howsubstances（物质）withdifferentdensity（密度）behavewhenplacedinthesamecontainer2Experiment3isanexampleofhowwaterdissolves（溶解）substancesandobjects3Experiment4illustratessomeofthedifferencesbetweensaltwaterandfreshwater4Part1:Whotellsthestoryinthepoem?2Whatdoesoneofthesailorsdo?3Whatdoyouthinkwillhappennext?4Whyaretheothersailorsfrig，