下学期Unit13高二英语课件
日期：2010-01-09 01:40
特性(举例说明，图解，阐明)howsubstanceswithdifferentdensitybehavewhenplacedinthesamecontainer2TheoilwillfloatabovethewaterbecauseofthedifferentdensityofthetwoListeningBackground:“TheRimeoftheAncientMariner”ColeridgeSamuelTaylor(1772—1834)，MarchWaterSavingLogoCollectasmanywordsaspossiblerelatedtowaterwaterriverlakeoceanfishsweaticesteamrainlet’sdiscusssomeexperimentsWhatpropertyofwaterdoeseachofthefourexperimentsillustrate(阐述）?Whatcausesthisphenomenon?What’sthisphenomenonrelatedto?propertyillustratessubstancedensitymarinern财产，Unit13ThewaterplanetwarmingupTheearthisawaterplanetAbout75%____ofthelivingspaceonearthisintheoceansMarinelifeisincrediblyrich&variedButnowthewateronourplanetisbecomingmoreandmorescarce99%Whatpercentageoftheearthiscoveredbywater?22nd，图解，)物质密度水手Experiments121Experiment1showshowairpressurecausesapieceofthickpapertoclingtoanupturnedglassofwater1Experiment2illustrates(举例说明，性质,
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