新人教版选修七 Unit 3 Under the sea-Warming up[课件].ppt

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1、UndertheSeaUnit3Today,we’regoingtotakealookattheworldunderthesea.So,areyouready?Now,weareonasnorkelingtripunderthesea.We’llcomeacrossagreatvarietyofmarineanimals.Comeon!Dolphins海豚Whatarethey?Turtle海龟Look.It’scomingtowardsus.Seahorse海马What’sthis?Squid鱿鱼Seastar海星Thislooksbeautiful!Jellyfish水母Co

2、ral珊瑚Angelfish天使鱼DifferentkindsoflittlefishAnemonefish海葵鱼ClownfishAsharkiscoming.Lookout!It’sdangerous.Henoticedus.We’dbetterleavehimalonebeforeit’stoolate.Bye,MrShark!Wearesafenow.AndIcaughtaseastarneartheshore.Ifyoulike,wherecanyougotoseemoreabouttheoceanlife?onaboattripinbooks,ontheInterne

3、t,intheOceanPark,onTVetc.atanaquariumIngroups,makealistofplantsandanimalsthatliveundertheseathatyouandyourclassmateshaveseeninanyofthewayslistedabove.Sharewhatyouknowabouttheseplantsandanimals.What’shappeninginthepictures?AKillerWhaleWhalesarehuge,intelligentseamammals.Theybreatheairthroughbl

4、ow-holesintolungs(unlikefishwhobreatheusinggills鳃).Whaleshavesmooth,shiny,streamlined(流线型）bodiesthatmoveeasilythroughthewater.Whatisawhale?Therearetwotypesofwhalesalivetoday:toothedwhales(齿鲸类)andbaleenwhales(须鲸类).Toothedwhaleshaveteethandasingleblowhole.Theyfeedoneatingfishandotherseamammals.

5、Baleenwhalesarelargerthantoothedwhales.Theyarefilterfeeders(滤食者)thatusebaleentosieve(过滤)food,andhavetwoblowholes.ClassificationofwhalesKillerwhales(虎鲸)belongtotoothedwhales,whoarethelargestofthedolphinsandkingofthesea,biggestcarnivore(食肉动物)ofthesea,killingallkindsofanimalsinthesea,eventhehuge

6、bluewhale,liketigersonland,workinginateam.Averagelifespan:50to80yearsSize:7to9.7mWeight:upto6tonsKillerwhalesBaleenwhalesarecharacterizedbyhavingbaleenplatesforfilteringfoodfromwater,ratherthanhavingteeth.Baleenwhalesaregenerallylargerthantoothedwhales,andfemalesarelargerthanmales.Thisgroupin

7、cludesthelargestknownanimalspecies,theBlueWhale.BaleenwhalesWhatdoyouthinkishappeninginthepicture?Readtheintroductionofthepassageonpage19andthenfillinthechartbelow.WriterJobStyleTimePlaceMainideaClancyAwhalerAnecdotesAtthebeginningofthe20thce