高二lesson62课件
日期：2010-05-07 05:29
marineanimalwithoutabackboneCoralssupporttheirsoftbodieswithinhollow“shells”ofbonelikematerialcoralavarietyofanimallifeofdifferentshapesandbrightcolorsconditionstoliveawatertemperatureabove20CplentyoflightclearwaterReadparagraph4，Talkaboutthepicture:Whatdoestheearthlooklike?Why?ListentothetextParagraph1Readthetextparagraphbyparagraph2/3surfaceismadeupofoceans1Whyistheearthblueseenfromspace?ThePacificOceanTheArcticOceanAsiaNorthAmericaAfricaEuropeSouthAmericaAntarcticOceania(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)Paragraph2vastsaltycleansalty35partsofsalt11mineralscleanwaterseaweedschemicals2Whyistheseasalty?3Whydoyousaytheseaisclean?Paragraph3TheMediterraneanSeaTheMediterraneanthelengththewidththesurfacewatersaltcontentandthereasonforitthetimetochangewiththeAtlantic3700km1800kmwarm25-29degreecentigrade37—39%80yearsthetemperatureofwaterinsummerParagraph4Whatisacoral?Acoralisasmall，answerthefollowingquestions:1wherecancoralsbefound?2whatisthesuit，
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