高二英语师大选择性必修一-Unit-3-Conservation-1课件

北京市中小学空中课堂选择性必修一Unit3Conservation(1)

高二年级英语北京市中小学空中课堂选择性必修一Unit3Conser1TheSixthExtinction

Reading(1)TheSixthExtinction

Reading(2ActivateandshareextinctionActivateandshareextinction3Activateandshare1.Whatisextinction?Extinctionisasituationinwhichsomethingnolongerexists.dinosaurActivateandshare1.Whatise4Activateandshare2.Howmuchdoyouknowaboutextinction?①HowmanytimesuptotodayhaslifeonEarthalmostdiedout?A.Once.B.Fivetimes.C.Morethan10times.Activateandshare2.Howmuch5Activateandshare②AboutwhichpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?A.Lessthan10%.B.Nearly50%.C.Morethan90%.Activateandshare②Aboutwhic6Activateandshare③Whatdoscientiststhinkwillcausethenextmassextinction?A.Humanactivity.B.Naturalcauses.C.Unknownreasons.Activateandshare③Whatdosc7Readandexplore1.Readthepassageandfinishthetwotasks:①

Checkwhetheryouranswersinthequizareright.②Getthemainideaofeachparagraph.Readandexplore8ReadandexploreChecktheanswersinthequiz.①HowmanytimesuptotodayhaslifeonEarthalmostdiedout?A.Once.B.Fivetimes.C.Morethan10times.ReadandexploreCheckthea9Readandexplore②

AboutwhichpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?A.Lessthan10%.B.Nearly50%.C.Morethan90%.③Whatdoscientiststhinkwillcausethenextmassextinction?A.Humanactivity.B.Naturalcauses.C.Unknownreasons.Readandexplore②Aboutwhich10ReadandexploreGetthemainideaofeachparagraph.Para.1:Para.2:Para.3:Para.4:BackgroundhistoryofthesixthextinctionCausesofthesixthextinctionEffectsofthesixthextinctionWhatwecandotopreventthesixthextinctionReadandexploreGetthemaini11ReadandexploreBackgroundhistoryCausesEffectsSolutionsTheSixthExtinctionDevelopmentofthepassageReadandexploreBackgroundhis12Readandexplore2.Readthepassageagainandcompletethenotes.Meaningofextinction:ExtinctionThenumberofextinctionsthathaveoccurredsofar:Twonotableextinctionsandtheirconsequences:Mainreasonsthatcauseextinctions:Howtoavoidthesixthmassextinction:Readandexplore2.Readthepa13ReadandexploreMeaningofextinction:ExtinctionentirespeciesarewipedoutReadandexploreMeaningofext14ReadandexploreExtinctionThenumberofextinctionsthathaveoccurredsofar:over90%ofallspeciesthateverlivedReadandexploreExtinctionThe15ReadandexploreExtinctionTwonotableextinctionsandtheirconsequences:thethirdmassextinctionkilled90%to96%ofallspecies;thefifthevent,whichoccurred66millionyearsago,causedthedeathofdinosaurs.ReadandexploreExtinctionTwo16ReadandexploreExtinctionMainreasonsthatcauseextinctions:volcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseofoxygencontentofthesea,globalwarmingReadandexploreExtinctionMain17ReadandexploreExtinctionHowtoavoidthesixthmassextinction:changethewaywelive,includingsettingupspecialareaswhereplantsandanimalscanbeprotected;changehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy;improveourfarmingmethodsReadandexploreExtinctionHow18ReadandexploreRetellthispartofthepassageaccordingtoyournotes.Meaningofextinction:ExtinctionThenumberofextinctionsthathaveoccurredsofar:Twonotableextinctionsandtheirconsequences:Mainreasonsthatcauseextinctions:Howtoavoidthesixthmassextinction:ReadandexploreRetellthispa19ReadandexploreRetelling

Extinctionmeanstheentirespeciesarewipedout.Sofarover90%ofallspeciesthateverlivedareextinct.Alongthehistory,thereare2notableextinctions,thethirdoneandthefifthone.Duringthethirdmassextinction,knownasthe“GreatDying”,90%to96%ofallspeciesdiedout.Thefifthone,whichoccurred66millionyearsago,causedthedeathofdinosaurs.ReadandexploreRetelling20ReadandexploreRetellingTherearemanyreasonsthatcauseextinctions,suchasvolcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseofoxygencontentoftheseaandglobalwarming.ReadandexploreRetelling21ReadandexploreRetellingThegoodnewsisthatwecandosomethingtoavoidthesixthmassextinction.Firstly,wehavetosignificantlychangethewaywelive.Weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected.Also,wecanchangehowweworkandtravelbyusingcleanerandmorenaturalsourcesofenergy,suchaswindandsolarenergy.Wealsoneedtoimproveourfarmingmethods.ReadandexploreRetelling22Readandexplore3.Readthepassageagainandanswerthequestions.

①Whatdidscientistsfindoutin2015?

②Whydoesthewriterthinkthesixthmassextinctionwillcome?

③Whydoesthewriterbelievewe’llprobablydieoutif75%oftheEarth’sspeciesdieout?

④Whatdidpeopledointhecasestudytoprotectblackrobins?Whichclaim(s)didthestudysupportinthetext?Readandexplore3.Readthepa23Readandexplore

①Whatdidscientistsfindoutin2015?Thestudylookedathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Theyfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.Readandexplore①Whatdidsc24Readandexplore②

Whydoesthewriterthinkthesixthmassextinctionwillcome?

BecausehumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.Readandexplore②Whydoesthe25Readandexplore

③

Whydoesthewriterbelievewe’llprobablydieoutif75%oftheEarth’sspeciesdieout?

Becauseourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.Readandexplore③Whydoesth26Readandexplore

④Whatdidpeopledointhecasestudytoprotectblackrobins?Whichclaim(s)didthestudysupportinthetext?

PeopleprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.Peoplearerestoringtheirhabitatsandremovingpestslikemiceandcatsfromtheislandswheretheylive.WhatwecandotopreventthesixthextinctionReadandexplore④Whatdidpe27ReadandexploreCausesEffectsAnexampleofprotectionTheSixthExtinctionRetellthispartofthepassage.ReadandexploreCausesEffectsA28Readandexplore

Thestudyin2015foundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.

RetellingReadandexploreThestudy29ReadandexploreRetelling

Thereisnodoubtthatourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.If75%oftheEarth’sspeciesdisappear,wehumanbeingswillalsofacetheriskofdyingout.

ReadandexploreRetellingT30ReadandexploreRetelling

Thegoodnewsisthatpeople