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1、Audio-VisualClassesUnit:13SwimmingwithSharksBackgroundNotes1-SharksSharksareatypeoffishwithafullskeletonandahighlystreamlinedbody.Theearliestknownsharksdatefrommorethan420millionyearsago.Sincethattime,sharkshavebeendividedinto440species,ranginginsizefrom17cminlength,tothewhaleshark,thel
2、argestfish,whichreachesabout12meters.Sharksarefoundinallseasandarecommondowntodepthsof2,000meters.Theygenerallydonotliveinfreshwater,withafewexceptionssuchasthebullsharkandtheriversharkwhichcanlivebothinseawaterandfreshwater.Theybreathethroughfivetosevengillslits.Sharkshaveacoveringofde
3、rmaldenticlesthatprotectstheirskinfromdamageandparasites,andimprovestheirfluiddynamicssothesharkcanmovefaster.Theyhaveseveralsetsofreplaceableteeth..2-GreatWhiteTheGreatWhiteShark,alsoknownasWhiteteeth,isanexceptionallylargelamnidae(oceanicshark)foundincoastalsurfacewatersinallmajorocea
4、ns.Reachinglengthsofabout6metersandweighingalmost2,000kg,thegreatwhitesharkistheworld’slargestknownpredatoryfish.3-SealIslanditisasmalllandmasslocatedabout5.7kmoffthenorthernbeachesofFalseBay,nearCapeTown,inSouthAfrica.TheislandisoccupiedbyCapeFurSealsandafewseabirds.4-Catch-22itmeansan
5、impossiblesituationthatyoucanotsolvebecauseyouneedtodoonethinginordertodoasecondthing,butyoucantdothe2ndthinguntilyouhavedonethefirst.ThistermalludestoCatch-22,anAmericanhistoricalnovelforJosephHeller,publishedin1961,anditisconsideredasoneofthegreatestliteraryworksofthe20thcentury.5-Jaw
6、sitisahorrormoviemadein1975,basedonPeterBenchley’sbest-sellingnovelofthesamename.inthismovie,agreatwhitesharkattackedalotofbeachgoersandkilledalotofswimmers,butfinallythepolicechiefhasmanagedtokilltheshark.GreatWhiteTigerSharkMakoSharkHammerheadSharkBullsharkWhalesharkHuntingSharksManki
7、lledbySharksSealsPre-listeningQuestions1-whatcomesupfirstonyourmindwhenyouheartheword“Sharks”?2-whataretheprecautionsyouhavetodowhenswimmingwithsharks?3-HaveyoueverwatchedanymoviesaboutSharks?Doyouthinkthemoviesshowedtherealfeaturesofsharks?WhilelisteningTASK11-D2-A3-C4-C5-B6-C
