Unit3ConservationLesson1TheSixthExtinction课件-高中英语北师大版(2019)选择性

Unit3ConservationLesson1TheSixthExtinction重点单词1．____________n.物种，种2．____________adj.异常的；不平常的3．____________adj.大量的4．____________adj.各种各样的，形形色色的5．____________vi.&vt.减少

n.减少；减少的量6．____________vt.责怪，指责7．____________vt.影响8．____________adj.濒危的9．____________adj.太阳光（能）的10．____________vi.&vt.（使）孵化11．____________vt.（使）恢复species

unusual

mass

varied

decreaseblame

affect

endangered

solar

hatch

restore

重点词块1．attherateof…________________2．bebasedon…________________3．layeggs________________4．beatrisk________________5．wipeout________________6．dieout________________7．upto…________________8．inshort________________9．accordingto________________10．takesteps________________11．betoblame________________

以……的速度/比例基于……

产卵/下蛋处境危险；受到威胁彻底毁灭消失；绝迹；灭绝高达……

简而言之根据；按照采取措施把……归咎于

()1.HowmanytimesuptotodayhaslifeonEarthalmostdiedouta.Once.b.Fivetimes.c.Morethan10times.1.HowmuchdoyouknowaboutextinctionChoosetheoptionbasedonyourknowledge.()2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”a.Lessthan10%.b.Nearly50%.c.Morethan90%.()3.Whatdoscientiststhinkwillcausethenextmassextinctiona.Humanactivity.b.Naturalcauses.c.Unknownreasons.bca2.Readandexplore.

Readatextaboutextinction.ThencheckyouranswersinActivity1.①Extinctions,whereentirespeciesarewipedout,arenotunusualinourEarth’shistory.Infact,over90percentofallspeciesthateverlivedarenowextinct.Inthelast500millionyears,therehavebeenfivetimes

whenlifeonEarthhasalmostended.

Theseincludethethirdmassextinction,knownasthe“GreatDying”,whichkilled90%to96%ofallspecies.Andthefifthevent,whichoccurred66millionyearsago,causedthedeathofthedinosaurs.Thereasonsforextinctionsarevaried.Accordingtoscientists,theyincludevolcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseoftheoxygencontentoftheseaandglobalwarming.ManyscientistssaywearenowenteringtheEarth’ssixthmassextinction.

Thistime,humanactivitywillbetoblame.非限制性定语从句限制性定语从句限制性定语从句非限制性定语从句非限制性定语从句承上启下②Althoughitisnotunusualforspeciestodieoutnaturally,therateatwhichthisisnowhappeningiscauseforconcern.A2015studybyscientistswhowerebasedatBrownUniversityandDukeUniversityintheUS,lookedathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Theyfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.Thereisalonglistofreasonswhysomanyspeciesaredyingout:airandwaterpollution,forestsbeingdestroyed,factoryfarmingandoverfishing.ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.双重否定,表示肯定Itisadjforsb/sthtodosth做...对某人/某物来说...限制性定语从句限制性定语从句宾语从句Itisadjthat......是怎么样的

Ifasixthmassextinctionoccurs,scientistswhohavestudiedtheissue

believethatuptothreequartersofallspeciesonEarthcoulddieout.Ofcourse,aswehumansdependonsomanyspeciesforoursurvival,wewouldalsobeatriskofdyingout.Ourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.Withoutforests,wewouldhavenoairtobreathe,andwithoutcleanwaterwewouldbeunabletosurvive.限制性定语从句宾语从句因为thenbetweenAandBA和B之间的...例：thecompetitionbetweenAandBA和B之间的竞争CanasixthextinctionbeavoidedExpertssaythatitisnotyettoolate,ifwetakeactionnow.Thiswouldmeanwehavetosignificantlychangethewaywelive.Forexample,weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected.Weneedtochangehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy,suchaswindandsolarenergy.Wealsoneedtoimproveourfarmingmethodstoreducewater,airandlandpollution.Inshort,ifwewanttosurvive,weneedtostopdestroyingtheplanetthatweliveonandstarttoprotectit.bedone(动词的过去分词)被动语态限制性定语从句Forinstance表目的表条件TheBlackRobinBlackrobinsarethebirdsthathumanssavedfromextinction.In1980,therewereonlyfiveblackrobinsleftintheworld.TheyalllivedonasmallislandoffthecoastofNewZealand.Onlyoneofthosebirds,afemalecalledOldBlue,wasabletolayeggs.Wildlifeworkersbeganaprogrammeforraisingblackrobinchicks.TheyprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.（幼鸟）

Thankstotheirefforts,therearenowmorethan250blackrobins,andthepopulation（数量）isspreading.Tohelpthemsurvive,peoplearerestoringtheirhabitatsandremovingsmallanimalsthathuntthem,suchasmiceandcatsfromtheislandswheretheylive.CaseStudyrobinn.知更鸟habitatn.栖息地限制性定语从句定语多亏，由于限制性定语从句练一练extinctionspecieswipesthoutglobalwarmingdieoutasituationinwhichsomethingnolongerexistsindangerofbeingharmedorlostthenaturalenvironmentinwhichananimalorplantusuallylivesasetofanimalsorplantsinwhichmembershavesimilarcharacteristicstoeachothertodestroysomethingcompletelyagradualincreaseinworldtemperaturescausedbygasessuchascarbondioxidethatarecollectingintheairaroundtheEarthandstoppingheatescapingintospacetobecomelesscommonandfinallystopexistingendangeredhabitat()1.HowmanytimesuptotodayhaslifeonEarthalmostdiedouta.Once.b.Fivetimes.c.Morethan10times.Activity1HowmuchdoyouknowaboutextinctionChoosetheoptionbasedonyourknowledge.()2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”a.Lessthan10%.b.Nearly50%.c.Morethan90%.()3.Whatdoscientiststhinkwillcausethenextmassextinctiona.Humanactivity.b.Naturalcauses.c.Unknownreasons.bcaActivity2Extinctions,whereentirespeciesarewipedout,arenotunusualinourEarth’shistory.Infact,over90percentofallspeciesthateverlivedarenowextinct.Inthelast500millionyears,therehavebeenfivetimeswhenlifeonEarthhasalmostended.Theseincludethethirdmassextinction,knownasthe“GreatDying”,whichkilled90%to96%ofallspecies.Andthefifthevent,whichoccurred66millionyearsago,causedthedeathofthedinosaurs.Thereasonsforextinctionsarevaried.Accordingtoscientists,theyincludevolcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseoftheoxygencontentoftheseaandglobalwarming.ManyscientistssaywearenowenteringtheEarth’ssixthmassextinction.Thistime,humanactivitywillbetoblamReadatextaboutextinction.ThencheckyouranswersinActivity1.Activity2Althoughitisnotunusualforspeciestodieoutnaturally,therateatwhichthisisnowhappeningiscauseforconcern.A2015studybyscientistswhowerebasedatBrownUniversityandDukeUniversityintheUS,lookedathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Theyfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.Thereisalonglistofreasonswhysomanyspeciesaredyingout:airandwaterpollution,forestsbeingdestroyed,factoryfarmingandoverfishing.ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.Readatextaboutextinction.ThencheckyouranswersinActivity1.Activity2Ifasixthmassextinctionoccurs,scientistswhohavestudiedtheissuebelievethatuptothreequartersofallspeciesonEarthcoulddieout.Ofcourse,aswehumansdependonsomanyspeciesforoursurvival,wewouldalsobeatriskofdyingout.Ourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.Withoutforests,wewouldhavenoairtobreathe,andwithoutcleanwaterwewouldbeunabletosurvive.Readatextaboutextinction.ThencheckyouranswersinActivity1.Activity2CanasixthextinctionbeavoidedExpertssaythatitisnotyettoolate,ifwetakeactionnow.Thiswouldmeanwehavetosignificantlychangethewaywelive.Forexample,weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected.Weneedtochangehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy,suchaswindandsolarenergy.Wealsoneedtoimproveourfarmingmethodstoreducewater,airandlandpollution.Inshort,ifwewanttosurvive,weneedtostopdestroyingtheplanetthatweliveonandstarttoprotectit.Readatextaboutextinction.ThencheckyouranswersinActivity1.TheBlackRobinBlackrobinsarethebirdsthathumanssavedfromextinction.In1980,therewereonlyfiveblackrobinsleftintheworld.TheyalllivedonasmallislandoffthecoastofNewZealand.Onlyoneofthosebirds,afemalecalledOldBlue,wasabletolayeggs.Wildlifeworkersbeganaprogrammeforraisingblackrobinchicks.TheyprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.Thankstotheirefforts,therearenowmorethan250blackrobins,andthepopulationisspreading.Tohelpthemsurvive,peoplearerestoringtheirhabitatsandremovingsmallanimalsthathuntthem,suchasmiceandcatsfromtheislandswheretheylive.CaseStudyNotesrobinn.知更鸟habitatn.栖息地PeopleprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.Peoplearerestoringtheirhabitatsandremovingpestslikemiceandcatsfromtheislandswheretheylive.Thecasestudyshowedthatevenindesperatesituations,wecandosomethingtohelp.Inshort,it’snevertoolate.4.Whatdidpeopledointhecase