Unit5RevealingnatureStartingout课件-高中英语选择性

Unit

5

Revealing

natureStarting

outWhatwillUnit5beaboutaccordingtothetitle?make(previouslyunknownorsecretinformation)knowntoothersrevealActivity1Lookatthepagefromasciencemagazineandanswerthequestions.1.Whatdoyouknowabouttheseanimals?Komododragon KomododragonswerefirstencounteredbyWesternresearchersin1910.TheresearcherssaidtheancestoroftheKomododragonmostlikelyevolvedinAustraliaandspreadwestward,reachingtheIndonesianislandofFlores900,000yearsago.Komododragon

TheKomododragonisthelargestlizardintheworld.Itcangrowtothreemetresinlengthandcanweighabout135kilograms.Despiteitssizeandweight,itcanrunforshortdistancesatupto20kilometresperhour. Thefirstscientiststoexamineapreservedplatypusbodyjudgeditafakeinthelate18thcentury.Theoldestdiscoveredfossilofthemodernplatypusdatesbacktoabout100,000yearsago.Duck-billedplatypus Theduck-billedplatypusisasmallegg-layingmammal(upto60cminlength)foundonlyinEasternAustraliaincludingTasmania.Asitsnamesuggests,ithasamouththatlookslikeaduck’sbill,whileitsthickfurandflattailaresimilartothoseofabeaver.Duck-billedplatypusNautilus Fossilrecordsindicatethatthenautilushassurvivedrelativelyunchangedforaround500millionyearsLongbeforedinosaursroamedtheEarth.Thatiswhyitisoftenconsidered“livingfossil.”Nautilus Atfirst,

prehistoricnautiluseshadstraightshells,buttheseevolvedintoacoiledshape.Prehistoricnautiluseshadshellsupto10feetinsize.Theydominatedtheseas,asfishhadn'tyetevolvedtocompetewiththemforprey.2.Whatmakestheseanimalsspecial? Theyareallspeciesthatexistthousandsofyearsonearth;Theyareoldandrare(unusual).Activity1Lookatthepagefromasciencemagazineandanswerthequestions.Activity2Watchthevideoandanswerthequestions.Howcanseedstravel?Howcanthisbenefitplants?Seedsusuallytravelbythewind,water,andanimalsorpeople.Plantscanhaveabetterchanceatlife.Howcanseedstravel?Howcanthisbenefitplants?Howcanwelearnfromthenaturalworld?Bybranchingoutandexploringthevariouswondersofnature.Activity3smartexpressions(P65&videoclip)朝西边蔓延认为…是赝品追溯到一个活化石传播到很远的地方旋转v.洋流硬壳消化系统生存几率更大朝新方向拓展探索大自然各种各样的奥秘spreadwestwardsjudge…afakedatebackto…alivingfossiltravelgreatdistancesspin(spin-spun-spun)

(spin-spinn