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1、UndertheSeaUnit3Wordspreviewsnorkelaquariumanecdoteannualvi.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,we’regoingtotakealookattheworldunderthesea.So,areyouready?Now,weareonasnorkelingtripunderthesea.We’llcomeacrossagreatvarietyofmarineanimals.Comeon!Dolphins海豚What
2、arethey?Turtle海龟Look.It’scomingtowardsus.Seahorse海马What’sthis?Squid鱿鱼Seastar海星Thislooksbeautiful!Jellyfish水母Coral珊瑚Angelfish天使鱼DifferentkindsoflittlefishAnemonefish海葵鱼ClownfishAsharkiscoming.Lookout!It’sdangerous.Henoticedus.We’dbetterleavehimalonebeforeit’stoolate.Bye,MrShark!Wearesaf
3、enow.AndIcaughtaseastarneartheshore.Ifyoulike,wherecanyougotoseemoreabouttheoceanlife?onaboattripinbooks,ontheInternet,intheOceanPark,onTVetc.atanaquariumIngroups,makealistofplantsandanimalsthatliveundertheseathatyouandyourclassmateshaveseeninanyofthewayslistedabove.Sharewhatyouknowabo
4、uttheseplantsandanimals.What’shappeninginthepictures?AKillerWhaleWhalesarehuge,intelligentseamammals.Theybreatheairthroughblow-holesintolungs(unlikefishwhobreatheusinggills).Whaleshavesmooth,shiny,streamlined(流线型）bodiesthatmoveeasilythroughthewater.Whatisawhale?Therearetwotypesofwhales
5、alivetoday:toothedwhales(齿鲸类)andbaleenwhales(须鲸类).Toothedwhaleshaveteethandasingleblowhole.Theyfeedoneatfishandotherseamammals.Baleenwhalesarelargerthantoothedwhales.Theyarefilterfeeders(滤食者)thatusebaleentosieve(过滤)food,andhavetwoblowholes.ClassificationofwhalesKillerwhales(虎鲸)belongto
6、toothedwhales,whoarethelargestofthedolphinsandkingofthesea,biggestcarnivore(食肉动物)ofthesea,killingallkindsofanimalsinthesea,eventhehugebluewhale,liketigersonland,workinginateam.Averagelifespan:50to80yearsSize:7to9.7mWeight:upto6tonsKillerwhalesBaleenwhalesarecharacterizedbyhavingbaleenp
7、latesforfilteringfoodfromwater,ratherthanhavingteeth.Baleenwhalesaregenerallylargerthantoothedwhales,andfemalesarelargerthanmales.Thisgroupincludesthelargestknownanimalspecies,theBlueWhale.BaleenwhalesWhatdoyouthinkishappeninginthepicture?Readtheintroductionofthepassageonpage19andthe
