Unit3ConservationLesson1TheSixthExtinction课件高中英语北师大版(2019)选择性必修第一册.pptx

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speciesunusualmassvarieddecreaseblameaffectendangeredsolarhatchrestore

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.HowmanytimesuptotodayhaslifeonEarthalmostdiedout?a.Once.b.Fivetimes.c.Morethan10times.1.Howmuchdoyouknowaboutextinction?Choosetheoptionbasedonyourknowledge.()2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?a.Lessthan10%.b.Nearly50%.c.Morethan90%.()3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivity.b.Naturalcauses.c.Unknownreasons.bca

2.Readandexplore.

Readatextaboutextinction.ThencheckyouranswersinActivity1.①Extinctions,whereentirespeciesarewipedout,arenotunusualinourEarth’shistory.Infact,over90percentofallspeciesthateverlivedarenowextinct.Inthelast500millionyears,therehavebeenfivetimeswhenlifeonEarthhasalmostended.Theseincludethethirdmassextinction,knownas