牛津英语 模块三 Unit1 Projectppt课件.ppt

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1、高中英语牛津版第三模块Unit1TheworldofoursensesProjectSharkattacksSharkSpeciesWhalesharkBaskingsharkGreatwhiteTigersharkBluesharkWhatareSharks?Sharksarefishthathavebeenlivingaroundussincethedinosaurs.Othersharkfacts:Sharkshavefivetosevengillslits(腮裂).Manysharksmustkeepmovinginorde

2、rtobreathe,thatis,inordertokeepwatermovingpasttheirgillslitsbutthisisnottrueforallspecies.Nursesharks,forexample,canliestillandfantheirgillstobringoxygen-richwateracrosstheslits.Becausetheylackaswimbladder,allsharksmustswiminordertoavoidsinkingtowardstheoceanfloor.Thes

3、harkhassensesspeciallyadaptedfortheanimal’slifeunderwater.Smellisashark’smostacutesense.About70percentoftheshark’sbrainisusedforsmellingfunctions.Experimentshaveshownthatsharkscandetectpreysolelybysmell,andthehungrierthesharkis,thelessstimulant(刺激物)neededtoelicit(引出)ar

4、eaction.Sharksaresensitivetolightandcandetectcertainobjectsevenindarkwater.Justlikecatsandotheranimalswhoseeyes‘glowinthedark’.Sharksdohaveears.Asharkcandetectsoundwavesanddisturbancesinthewater.Sharkscanalsosenseelectricandmagneticfields(磁场).Fastreading:1.Aresharksfri

5、ghtening?2.Howmanydifferenttypesofsharksarethereintheocean?Doallofthemattackhumans?3.Dosharksfeedonhumansiftheyhavethechoice?4.Whatarethethreetypesofsharkattacks?5.Whyhavesharkattacksbeenincreasingrecently?Threefiercesharks:Fillintheinformationthegreatwhitesharkthetige

6、rsharkthebullsharkReadthetextagainandtrytofindoutthetopicsentenceofeachparagraph.(Thetopicsentencesmayappearatthebeginningoftheparagraph,orattheend.)CarefulreadingParagraph1:30outof400sharksmayattackhumans.Paragraph2:Therearethreetypesofsharkattacks.Paragraph3:Adviceon

7、helpingreducethechancesofbeingattacked.Paragraph4:Threetipstohelpyouwhenattackedbyashark.Paragraph5:Donotbefrightenedbysharks.Fourpiecesofadvicetoavoidsharkattacks:Don’tswiminthedark.Don’tswimifyouhaveafreshwound.Don’twearbrightclothingorjewellery.Stayingroups.Threeti

8、pstohelpyouifasharkattacksyouKeepclam.Hitthesharkonthenosewithyourfist.Stickyourfingerintheshark’seye.Usefulphrases1.