人教新课标选修7第3单元完整ppt课件

.,1,UndertheSea,Unit3,.,2,Wordspreview,snorkelaquariumanecdoteannual,vi.戴潜水通气管潜泳n.(潜水艇或潜水者)通气管n.水族馆；养鱼缸n.轶事；奇闻adj.每年的；按年度计算的n.年刊；年鉴,.,3,Today,weregoingtotakealookattheworldunderthesea.So,areyouready?,.,4,Now,weareonasnorkelingtripunderthesea.,Wellcomeacrossagreatvarietyofmarineanimals.Comeon!,.,5,Dolphins海豚,Whatarethey?,.,6,Turtle海龟,Look.Itscomingtowardsus.,.,7,Seahorse海马,Whatsthis?,.,8,Squid鱿鱼,.,9,Seastar海星,Thislooksbeautiful!,.,10,Jellyfish水母,.,11,Coral珊瑚,.,12,Angelfish天使鱼,Differentkindsoflittlefish,.,13,Anemonefish海葵鱼,.,14,Clownfish,.,15,Asharkiscoming.Lookout!Itsdangerous.,.,16,Henoticedus.Wedbetterleavehimalonebeforeitstoolate.Bye,MrShark!,.,17,Wearesafenow.AndIcaughtaseastarneartheshore.,.,18,Ifyoulike,wherecanyougotoseemoreabouttheoceanlife?,onaboattrip,inbooks,ontheInternet,intheOceanPark,onTVetc.,atanaquarium,.,19,Ingroups,makealistofplantsandanimalsthatliveundertheseathatyouandyourclassmateshaveseeninanyofthewayslistedabove.Sharewhatyouknowabouttheseplantsandanimals.,.,20,Whatshappeninginthepictures?,AKillerWhale,.,21,Whalesarehuge,intelligentseamammals.Theybreatheairthroughblow-holesintolungs(unlikefishwhobreatheusinggills).Whaleshavesmooth,shiny,streamlined(流线型）bodiesthatmoveeasilythroughthewater.,Whatisawhale?,.,22,Therearetwotypesofwhalesalivetoday:toothedwhales(齿鲸类)andbaleenwhales(须鲸类).Toothedwhaleshaveteethandasingleblowhole.Theyfeedoneatfishandotherseamammals.Baleenwhalesarelargerthantoothedwhales.Theyarefilterfeeders(滤食者)thatusebaleentosieve(过滤)food,andhavetwoblowholes.,Classificationofwhales,.,23,Killerwhales(虎鲸)belongtotoothedwhales,whoarethelargestofthedolphinsandkingofthesea,biggestcarnivore(食肉动物)ofthesea,killingallkindsofanimalsinthesea,eventhehugebluewhale,liketigersonland,workinginateam.,.,24,Averagelifespan:50to80yearsSize:7to9.7mWeight:upto6tons,.,25,Killerwhales,.,26,Baleenwhalesarecharacterizedbyhavingbaleenplatesforfilteringfoodfromwater,ratherthanhavingteeth.Baleenwhalesaregenerallylargerthantoothedwhales,andfemalesarelargerthanmales.Thisgroupincludesthelargestknownanimalspecies,theBlueWhale.,.,27,Baleenwhales,.,28,Whatdoyouthinkishappeninginthepicture?,Readtheintroductionofthepassageonpage19andthenfillinthechartbelow.,.,29,Clancy,Awhaler,Anecdotes,Atthebeginningofthe20thcentury,SoutheasterncoastofAustralia,Thekillerwhaleshelpedthewhalerskillbaleenwhales,Briefintroductionofthepassage,.,30,Ho