高中英语 Unit4Exploring plants-Listening课件 新人教选修9 课件VIP免费

Listening1.Howwouldyoudescribeeachplant?Whatdoyouthinkisunusualabouteachplant?2.Oneofthepicturesshowspitcherplantsandanothershows“livingstones”.Whichpictureshowswhichplant?ThenameoftheplantintheotherpictureisRafflesia.ListeningonP36Lookcarefullyatthephotosoftheplantsandanswerthequestions.livingstoneRafflesiapitcherplantsPitcherplantNowlistentoMark,GordonandAndreatellingtheirclassabouttheseplants.Whichstudenttalksaboutwhichplant?PlantABCStudent’snameNameoftheplantMarkPitcherplantLivingstonesorLithopsGordonRafflesiaarnoldiiAndreaListentotheotherstudents’reactionstoMark,GordonandAndrea’sdescriptionsoftheplants.Writedowntheexpressionstheyuse.Expressionsofwonder:That’samazing!Whatfantasticplants!Wow!Howinteresting!Ithinkit’sfantastic!Expressionsofdisgust:Oh,yuck!That’sdisgusting!UNUSUALPLANTTH:TodayMark,GordonandAndreaaregoingtotellusaboutsomeunusualplants.Mark,doyouwanttogofirst?M:Sure.Today,Iwanttotalkaboutaninsect-eatingplantcalledapitcherplant.ListeningtextHere’saphotoofit.Lookatthisparthere.It’sshapedlikeapitcher.It’sactuallyaleafeventhoughitlookslikeaflower.It’sreallyclever---theinsectsareattractedbythesweetsmellcomingfromwhattheythinkisaflower.Butit’satrap.Onceaninsectgoesdownintothepitcher,itcan’tgetoutastherearesmallhardhairspointingdownwardsthatpreventitfromescaping.Intheend,theinsectfallsdownintoapoolofliquidatthebottomofthepitcherandgetsdigestedbytheplant.S1:That’samazing!S2:Whatfantasticplants!TH:Gordon.G:ThesearetheplantsI’mgoingtotalkabout.They’reoftencalled“livingstones”,buteventhoughtheydolookabitlikestones,theyareinfactplants.S3:Wow!S4:Howinteresting!G:TheirscientificnameisLithopsandtheycomefromSouthAfricaandNambia.Thebodyofalithopsisactuallyapairofleavesthathavebecomeroundedlikeastone.Thisisbecausethisplantlivesinveryhotanddryplaces.Whentheleavesareshapedlikethis,notmuchwaterislostfromtheplant.Anotherinterestingthingaboutthesestrangeplantsisthatthey’rethesamecolourandappearanceofthesoilandstonesaroundit.Thismakesthemlessobvioustoanimallookingforfood.TH:Thanks,Gordon.Andrea.A:I’mgoingtotellyouaboutRafflesiaarnoldii,aplantthathasafloweraboutonemetrewide.Infact,it’sthelargestflowerintheworld.Rafflesiaarnoldiidoesn’thaveanyleaves,stemsorroots.Itdoesn’tneedthemasit’saparasite.Itgetsthisfoodbylivingonanotherplant.Youmightthinkthatthisflowershouldsmellwonderfulbutitactuallylooksandsmellslikerottingmeat!S2:Oh,yuck!S1:That’sdisgusting!S3:Ithinkit’sfantastic!A:Metoo.Anyway,itattractsinsectsthateatdeadanimalsbutinsteadofgettingafeed,theinsectspickupitspollenandspreadittootherRafflesias,RafflesiaarnoldiigrowsinthejunglesinIndonesiabutastheforestsarebeingcutdown,it’sbecomingveryrare.TH:ThanksAndreaandthankseveryone.Thoseplantsarecertainlyfascinating.ListeningonP75Pre-listening1.Inwhichpartsofthewordwouldyoufindtropicalrainforests?Tropicalrainforestsoccurinthreemajorregions:Asia,AfricaandCentralandSouthAmerica.2.Whydoyouthinkrainforestsarebeingcutdown?Aspopulationsincrease,peopleneedmorelandtoliveon.Therearealsominingcompanieswhichdestroyforestsintheirsearchforminerals.3.Whydoyouthinktropicalrainforestsareimportanttotheworld?Becausethereareabout10millionspeciesofplantandanimalintheworld.Morethanhalfoftheseliveinthetropicalrainforests.Therainforestcouldprovideuswithcuresfordiseases.Also,rainforestsabsorbalotofrainsothatthere’saconstantsupplyo...