unit13readingnew课件
日期：2010-10-19 10:41
Whatpercentageoftheearthiscoveredbywater?About75%____ofthelivingspaceonearthisintheoceansMarinelifeisincredibly_________________99%richandvariedHowmanyspeciesarethereintheoceans?Thereareaboutfivemillionspecies，rangingfromthetiniestplanktontogiantslikesharksandwhales_________makestheoceansuchagreatplacetoliveStep4Multiplechoices1Whatislifeintheoceanlike?AMarinelifeisverysmallBMarinelifeisverylargeCMarineliferangesfromthetiniestplantstogiantslikesharksandwhalesDLifehereiscolorfulbutdifficultCanyouthinkofanyotherfactsconnectedwiththepropertiesofwater?C2Whatgiveswateritsuniqueproperties?AThewaythewatermoleculeisformedBThelargeamountCItcanexistinthreestatesDIthasarelativelyhighfreezingpoint3Whatisproducedwhendissolvedgasesandsolidsmixwithpurewater?AfreshwaterBseawaterCoxygenatomsDiceAB4Whyisthewaterintheoceanalwaysmoving?Becauseofthe，
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