人教新课标选修7第3单元整理PPT课件

.,UndertheSea,Unit3,.,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,.,Today,weregoingtotakealookattheworldunderthesea.So,areyouready?,.,Now,weareonasnorkelingtripunderthesea.,Wellcomeacrossagreatvarietyofmarineanimals.Comeon!,.,Dolphins海豚,Whatarethey?,.,Turtle海龟,Look.Itscomingtowardsus.,.,Seahorse海马,Whatsthis?,.,Squid鱿鱼,.,Seastar海星,Thislooksbeautiful!,.,Jellyfish水母,.,Coral珊瑚,.,Angelfish天使鱼,Differentkindsoflittlefish,.,Anemonefish海葵鱼,.,Clownfish,.,Asharkiscoming.Lookout!Itsdangerous.,.,Henoticedus.Wedbetterleavehimalonebeforeitstoolate.Bye,MrShark!,.,Wearesafenow.AndIcaughtaseastarneartheshore.,.,Ifyoulike,wherecanyougotoseemoreabouttheoceanlife?,onaboattrip,inbooks,ontheInternet,intheOceanPark,onTVetc.,atanaquarium,.,Ingroups,makealistofplantsandanimalsthatliveundertheseathatyouandyourclassmateshaveseeninanyofthewayslistedabove.Sharewhatyouknowabouttheseplantsandanimals.,.,Whatshappeninginthepictures?,AKillerWhale,.,Whalesarehuge,intelligentseamammals.Theybreatheairthroughblow-holesintolungs(unlikefishwhobreatheusinggills).Whaleshavesmooth,shiny,streamlined(流线型）bodiesthatmoveeasilythroughthewater.,Whatisawhale?,.,Therearetwotypesofwhalesalivetoday:toothedwhales(齿鲸类)andbaleenwhales(须鲸类).Toothedwhaleshaveteethandasingleblowhole.Theyfeedoneatfishandotherseamammals.Baleenwhalesarelargerthantoothedwhales.Theyarefilterfeeders(滤食者)thatusebaleentosieve(过滤)food,andhavetwoblowholes.,Classificationofwhales,.,Killerwhales(虎鲸)belongtotoothedwhales,whoarethelargestofthedolphinsandkingofthesea,biggestcarnivore(食肉动物)ofthesea,killingallkindsofanimalsinthesea,eventhehugebluewhale,liketigersonland,workinginateam.,.,Averagelifespan:50to80yearsSize:7to9.7mWeight:upto6tons,.,Killerwhales,.,Baleenwhalesarecharacterizedbyhavingbaleenplatesforfilteringfoodfromwater,ratherthanhavingteeth.Baleenwhalesaregenerallylargerthantoothedwhales,andfemalesarelargerthanmales.Thisgroupincludesthelargestknownanimalspecies,theBlueWhale.,.,Baleenwhales,.,Whatdoyouthinkishappeninginthepicture?,Readtheintroductionofthepassageonpage19andthenfillinthechartbelow.,.,Clancy,Awhaler,Anecdotes,Atthebeginningofthe20thcentury,SoutheasterncoastofAustralia,Thekillerwhaleshelpedthewhalerskillbaleenwhales,Briefintroductionofthepassage,.,Hom