北师大版(2019)高一英语选择性必修Unit3课件.ppt
- 文档编号:430369
- 上传时间:2023-04-29
- 格式:PPT
- 页数:35
- 大小:2.16MB
北师大版(2019)高一英语选择性必修Unit3课件.ppt
《北师大版(2019)高一英语选择性必修Unit3课件.ppt》由会员分享,可在线阅读,更多相关《北师大版(2019)高一英语选择性必修Unit3课件.ppt(35页珍藏版)》请在冰点文库上搜索。
,选择性必修一Unit3Conservation
(1),TheSixthExtinctionReading
(1),Activateandshare,extinction,Activateandshare,1.Whatisextinction?
Extinctionisasituationinwhichsomethingnolongerexists.,dinosaur,Activateandshare,2.Howmuchdoyouknowaboutextinction?
HowmanytimesuptotodayhaslifeonEarthalmostdiedout?
A.Once.B.Fivetimes.C.Morethan10times.,Activateandshare,AboutwhichpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?
A.Lessthan10%.B.Nearly50%.C.Morethan90%.,Activateandshare,Whatdoscientiststhinkwillcausethenextmassextinction?
A.Humanactivity.B.Naturalcauses.C.Unknownreasons.,Readandexplore,1.Readthepassageandfinishthetwotasks:
Checkwhetheryouranswersinthequizareright.Getthemainideaofeachparagraph.,Readandexplore,Checktheanswersinthequiz.,HowmanytimesuptotodayhaslifeonEarthalmostdiedout?
A.Once.B.Fivetimes.C.Morethan10times.,Readandexplore,AboutwhichpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?
A.Lessthan10%.B.Nearly50%.C.Morethan90%.Whatdoscientiststhinkwillcausethenextmassextinction?
A.Humanactivity.B.Naturalcauses.C.Unknownreasons.,Readandexplore,Getthemainideaofeachparagraph.,Para.1:
Para.2:
Para.3:
Para.4:
Backgroundhistoryofthesixthextinction,Causesofthesixthextinction,Effectsofthesixthextinction,Whatwecandotopreventthesixthextinction,Readandexplore,Backgroundhistory,Causes,Effects,Solutions,TheSixthExtinction,Developmentofthepassage,Readandexplore,2.Readthepassageagainandcompletethenotes.,Extinction,Readandexplore,Extinction,entirespeciesarewipedout,Readandexplore,Extinction,over90%ofallspeciesthateverlived,Readandexplore,Extinction,thethirdmassextinctionkilled90%to96%ofallspecies;thefifthevent,whichoccurred66millionyearsago,causedthedeathofdinosaurs.,Readandexplore,Extinction,volcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseofoxygencontentofthesea,globalwarming,Readandexplore,Extinction,changethewaywelive,includingsettingupspecialareaswhereplantsandanimalscanbeprotected;changehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy;improveourfarmingmethods,Readandexplore,Retellthispartofthepassageaccordingtoyournotes.,Extinction,Readandexplore,Retelling,Extinctionmeanstheentirespeciesarewipedout.Sofarover90%ofallspeciesthateverlivedareextinct.Alongthehistory,thereare2notableextinctions,thethirdoneandthefifthone.Duringthethirdmassextinction,knownasthe“GreatDying”,90%to96%ofallspeciesdiedout.Thefifthone,whichoccurred66millionyearsago,causedthedeathofdinosaurs.,Readandexplore,Retelling,Therearemanyreasonsthatcauseextinctions,suchasvolcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseofoxygencontentoftheseaandglobalwarming.,Readandexplore,Retelling,Thegoodnewsisthatwecandosomethingtoavoidthesixthmassextinction.Firstly,wehavetosignificantlychangethewaywelive.Weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected.Also,wecanchangehowweworkandtravelbyusingcleanerandmorenaturalsourcesofenergy,suchaswindandsolarenergy.Wealsoneedtoimproveourfarmingmethods.,Readandexplore,3.Readthepassageagainandanswerthequestions.,Whatdidscientistsfindoutin2015?
Whydoesthewriterthinkthesixthmassextinctionwillcome?
Whydoesthewriterbelievewellprobablydieoutif75%oftheEarthsspeciesdieout?
Whatdidpeopledointhecasestudytoprotectblackrobins?
Whichclaim(s)didthestudysupportinthetext?
Readandexplore,Whatdidscientistsfindoutin2015?
Thestudylookedathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Theyfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.,Readandexplore,Whydoesthewriterthinkthesixthmassextinctionwillcome?
BecausehumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.,Readandexplore,Whydoesthewriterbelievewellprobablydieoutif75%oftheEarthsspeciesdieout?
Becauseourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.,Readandexplore,Whatdidpeopledointhecasestudytoprotectblackrobins?
Whichclaim(s)didthestudysupportinthetext?
PeopleprotectedOldBlueseggs,helpedthemtohatch,andtookcareofthechicks.Peoplearerestoringtheirhabitatsandremovingpestslikemiceandcatsfromtheislandswheretheylive.Whatwecandotopreventthesixthextinction,Readandexplore,Causes,Effects,Anexampleofprotection,TheSixthExtinction,Retellthispartofthepassage.,Readandexplore,Thestudyin2015foundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.,Retelling,Readandexplore,Retelling,Thereisnodoubtthatourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.If75%oftheEarthsspeciesdisappear,wehumanbeingswillalsofacetheriskofdyingout.,Readandexplore,Retelling,ThegoodnewsisthatpeoplearedoingsomethingtoprotectanimalsandplantsonEarth.Forexample,peoplearetakingmeasurestoprotectanendangeredbirdcalledOldBlue.Throughourefforts,thenumberofthisbirdisincreasingsteadily.Therefore,yousee,wecandosomethingtohelptheearthanditsnevertoolatetoact.,Thinkandshare,Asastudent,whatdoyouthinkyoucandotohelptheEarth?
reducewaste,putrubbishintoseparatedustbins,cycleortakepublictransportation,usefewerplasticbagswhilegoingshopping,Summary,Backgroundhistory,Causes,Effects,Solutions,TheSixthExtinction,Homework,1.Readthepassagealoud.2.Writeashortpassageaboutthesixthextinction.,Thankyou!
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 北师大 2019 英语 选择性 必修 Unit3 课件