牛津高中英语 模块3 Unit 1 project.ppt

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1、Unit1ProjectProducingaTVshowSharkattacksSharkSpeciesWhalesharkBullsharkGreatwhiteTigersharkOthersharkfactsSharkshavefivetosevengillslits(鳃裂).Manysharksmustkeepmovinginordertobreathethatis,inordertokeepwatermovingpasttheirgillslitsbutthisisnottrueofallspecies.Nursesharks,forexample,canli

2、estillandfantheirgillstobringoxygen-richwateracrosstheslits.Becausetheylackaswimbladder(气囊),allsharksmustswiminordertoavoidsinkingtowardtheoceanfloor.Thesharkhassensesspeciallyadaptedfortheanimal'slifeunderwater.Smellisashark'smostacutesense.Approximately70percentoftheshark'sbrainisused

3、forsmellingfunctions.Experimentshaveshownthatsharkscandetectanimalsbysmell.Sharksaresensitivetolightandcandetectcertainobjectseveninmuddywater.Somehaveamirror-likelayerundertheretina(视网膜)oftheeyethatreflectsincominglightandincreasestheamountoflightavailabletotheeye.(Catsandotheranimalsw

4、hoseeyes"glowinthedark"alsohavethisfeature.)Sharkscanalsosenseelectricandmagneticfields.Sensoryporeslocatedontheshark‘sheadcandetectaprey’sbioelectricfieldevenifthepreyisburiedinsand.AsharkcanalsodetecttheEarth‘smagneticfield.Open-oceansharksmayusethisinformationtonavigate(导航)andorient(

5、定位)themselves.Sharkwaterisa2006CanadiandocumentaryfilmwrittenanddirectedbyRobStewart,whoalsonarratesit.Inthefilm,Stewartseekstodeflatecurrentattitudesaboutsharks,andexposeshowthevoracious(贪吃的,胃口极大的)shark-huntingindustryisdrivingthemtoextinction.DocumentReadingformainidea:Para.1Therearen

6、early400typesofsharks,andsomewell-knowntypesofsharksthatattackhumans.Para.2ThreetypesofsharkattacksPara.3FourtipsonhowtoavoidbeingattackedPara.4Anincreaseinwatersportshasledtoanincreaseinsharkattacks.Threetipsonwhattodoifasharkattacks.Para.5:Donotbefrightenedbysharks.Thewonderfulworldof

7、pigeonFromancienttimes,pigeons—especiallyhomingpigeons,whicharealsousedasracingbirds—havebeenusedforcarryingmessages.Althoughelectronicshaslargelyreplacedthemasmessengers,theyarestillofexperimentalimportance.Readingforquestions:Whatdoesthearticlebeginwith?Whatisthestoryabout?Wh