unit13reading高二英语课件
日期：2010-09-27 09:06
Unit13TheWaterplanetTheearthisawaterplanetAbout75%%ofthelivingspaceonearthisintheoceans99Whatpercentageoftheearthiscoveredbywater?Thereareaboutfivemillionspecies，rangingfromthetiniestplanktontogiantslikesharksandwhalesHowmanyspeciesarethereintheoceans?_________makestheoceansuchagreatplacetoliveinStructureofthepassagePara1MarinelifechemicalstructurePara2salinityPara3DensityPara4HeatCapacityPara5OceanmotionPara6Howisthetextorganized?Para7TheimportanceofprotectingwaterTopicSentenceofthetext:Paragraph:________Sentence:TopicSentenceofSALINITY:Paragraph:______Sentence:TopicSentenceofCHEMICALSTRUCTURE:Paragraph:________Sentence:FindingTopicSentences732LearningaboutthepropertiesofwaterhelpsusunderstandlifeonourplanetThechemicalstructureofwatermakesitanexcellentmediumforlifeThesalinityoftheearthsoceansisaboutthirty-fivepartsperthousand，meaningthatthereareaboutthirty-fivegrammesofdi，
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