【whatdoesthesaltwaterrefersto(指的是）?（InEnglish）Weallknowthatdogs,pigs,andmonkeysareveryintelligentanimals.Butwhenitcomestounderwaterintelligence,1noanimalissmarterthanthedolphin.Nooneknowsforsurehowsmartd】

　　whatdoesthesaltwaterrefersto(指的是）?（InEnglish）

　　Weallknowthatdogs,pigs,andmonkeysareveryintelligentanimals.Butwhenitcomestounderwaterintelligence,1noanimalissmarterthanthedolphin.Nooneknowsforsurehowsmartdolphinsare,butwedoknowtheyarefastlearners.Theycanperform2manyamazing3tricks,suchasringingbellswiththeirsnouts,shakinghandswiththeirflippers,andtakingbows.Theycanevenact.InthemovieFlipper,adolphinwasthemainstar!

　　Becausemostdolphinsliveintheocean,youmightthinkthey’refish.Actually,theyaremammals,justlikepeople.Thatmeanstheygrowhair,givemilktotheiryoung,andbreatheair.Everysooften,thedolphinmustrisetothesurfaceandbreathethroughitsblowhole.Likelandanimals,dolphinscan’tdrink___saltwater___.Theygetmostoftheirfreshwaterfromtheirfood.Soeventhoughdolphinsliveunderwater,theysurvive4justlikedesert5animals,withnodirectsource6ofdrinkingwater.