Unit3ConservationLesson1TheSixthExtinction課件-高中英語北師大版(2019)選擇性

Unit3ConservationLesson1TheSixthExtinction重點單詞1．____________n.物種，種2．____________adj.異常的；不平常的3．____________adj.大量的4．____________adj.各種各樣的，形形色色的5．____________vi.&vt.減少

n.減少；減少的量6．____________vt.責怪，指責7．____________vt.影響8．____________adj.瀕危的9．____________adj.太陽光（能）的10．____________vi.&vt.（使）孵化11．____________vt.（使）恢復species

unusual

mass

varied

decreaseblame

affect

endangered

solar

hatch

restore

重點詞塊1．a(chǎn)ttherateof…________________2．bebasedon…________________3．layeggs________________4．beatrisk________________5．wipeout________________6．dieout________________7．upto…________________8．inshort________________9．a(chǎn)ccordingto________________10．takesteps________________11．betoblame________________

以……的速度/比例基于……

產(chǎn)卵/下蛋處境危險；受到威脅徹底毀滅消失；絕跡；滅絕高達……

簡而言之根據(jù)；按照采取措施把……歸咎于

()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.非限制性定語從句限制性定語從句限制性定語從句非限制性定語從句非限制性定語從句承上啟下②Althoughitisnotunusualforspeciestodieoutnaturally,therateatwhichthisisnowhappeningiscauseforconcern.A2015studybyscientistswhowerebasedatBrownUniversityandDukeUniversityintheUS,lookedathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Theyfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.Thereisalonglistofreasonswhysomanyspeciesaredyingout:airandwaterpollution,forestsbeingdestroyed,factoryfarmingandoverfishing.ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.雙重否定,表示肯定Itisadjforsb/sthtodosth做...對某人/某物來說...限制性定語從句限制性定語從句賓語從句Itisadjthat......是怎么樣的

Ifasixthmassextinctionoccurs,scientistswhohavestudiedtheissue

believethatuptothreequartersofallspeciesonEarthcoulddieout.Ofcourse,aswehumansdependonsomanyspeciesforoursurvival,wewouldalsobeatriskofdyingout.Ourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.Withoutforests,wewouldhavenoairtobreathe,andwithoutcleanwaterwewouldbeunabletosurvive.限制性定語從句賓語從句因為thenbetweenAandBA和B之間的...例：thecompetitionbetweenAandBA和B之間的競爭CanasixthextinctionbeavoidedExpertssaythatitisnotyettoolate,ifwetakeactionnow.Thiswouldmeanwehavetosignificantlychangethewaywelive.Forexample,weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected.Weneedtochangehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy,suchaswindandsolarenergy.Wealsoneedtoimproveourfarmingmethodstoreducewater,airandlandpollution.Inshort,ifwewanttosurvive,weneedtostopdestroyingtheplanetthatweliveonandstarttoprotectit.bedone(動詞的過去分詞)被動語態(tài)限制性定語從句Forinstance表目的表條件TheBlackRobinBlackrobinsarethebirdsthathumanssavedfromextinction.In1980,therewereonlyfiveblackrobinsleftintheworld.TheyalllivedonasmallislandoffthecoastofNewZealand.Onlyoneofthosebirds,afemalecalledOldBlue,wasabletolayeggs.Wildlifeworkersbeganaprogrammeforraisingblackrobinchicks.TheyprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.（幼鳥）

Thankstotheirefforts,therearenowmorethan250blackrobins,andthepopulation（數(shù)量）isspreading.Tohelpthemsurvive,peoplearerestoringtheirhabitatsandremovingsmallanimalsthathuntthem,suchasmiceandcatsfromtheislandswheretheylive.CaseStudyrobinn.知更鳥habitatn.棲息地限制性定語從句定語多虧，由于限制性定語從句練一練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.知更鳥habitatn.棲息地PeopleprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.Peoplearerestoringtheirhabitatsandremovingpestslikemiceandcatsfromtheislandswheretheylive.Thecasestudyshowedthatevenindesperatesituations,wecandosomethingtohelp.Inshort,it’snevertoolate.4.Whatdidpeopledointhecase