Unit3ConservationLesson1TheSixthExtinction課件高中英語北師大版選擇性

-Unit3Conservation-Lesson1TheSixthExtinctionLeadinWhatcanyouseeinthepicture?1Whatdoesextinctionmean?2Pre-reading1.HowmanytimesuptotodayhaslifeonEarthalmostdiedout?a.Onceb.Fivetimesc.Morethan10times2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?a.Lessthan10%b.Nearly50%c.Morethan90%3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivityb.Naturalcausesc.UnknownreasonsHowmuchdoyouknowaboutthem?Choosetheoptionbasedonyourknowledge.Pre-reading1.HowmanytimesuptotodayhaslifeonEarthalmostdiedout?a.Onceb.Fivetimesc.Morethan10times2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?a.Lessthan10%b.Nearly50%c.Morethan90%3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivityb.Naturalcausesc.UnknownreasonsHowmuchdoyouknowaboutthem?Choosetheoptionbasedonyourknowledge.While-readingReadthetextaboutextinctionandfindthemainideaforeachparagraph.acauses/reasonsbwhatmighthappencwhatwecandodbackgroundhistory

While-readingReadPara.1andanswerthequestion.ExtinctionMeaningThenumberofextinctionthathaveoccurredsofarTwonotableextinctionandtheirconsequencesTheusualreasonEntirespeciesarewipedout.Five.Thethirdone(“GreatDying”):Killed90%to96%ofallspecies.Thefifthone:Causedthedeathofthedinosaurs.Volcaniceruption;AsteroidshittingtheEarthfromspace;Changesinsealevels;Thedecreaseoftheoxygencontentoftheseaandglobalwarming.While-readingReadPara.2andanswerthequestion.1.Whatdidscientistsfindoutin2015?2.Whatarethemainreasonsthatcausethesixthextinctions?Scientistsfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.1)Airandwaterpollution;2)Forestsbeingdestroyed;3)Factoryfarming;4)Overfishing.While-readingReadPara.3andanswerthequestion.Whydoesthewriterbelievewe’llprobablydieoutif75%oftheEarth’sspeciesdieout?Becauseourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.While-readingReadPara.4andanswerthequestion.Whatdidpeopledointhecasestudytoprotectblackrobins?Whichclaim(s)didthecasestudysupportinthetext?Changethewaywelive;Setupspecialareasforendangeredspecies;Changethewayweworkandtravel;Improveourfarmingmethodstoreducewater,airandlandpollution.While-readingReadTheBlackRobinandanswerthequestion.1.Whatdidpeopledointhecasestudytoprotectblackrobins?2.Whichclaim(s)didthecasestudysupportinthetext?Thecasestudyshowedthatevenindesperatesituations,wecandosomethingtohelp.Inshort,it’snevertoolate.Post-readingUsedifferentcoloredpenstohighlightatleastoneexampleforeachofthefourelementslistedbelow.factsopinions/predictionsreasonssolutionsPost-reading·facts·reasons·opinions/predictions·solutions123231212331Think&answer1.Whattexttypeisthispieceofwriting?2.Whatisitscommunicativepurpose?3.Whatwaysofargumentdoesthewriter

usetoconvincereaders?Areyouconvinced?Whyorwhynot?1.Whattexttypeisthispieceofwriting?A.Argumentation(議論文）B.Narration(記敘文）C.Application(應(yīng)用文）D.Exposition(說明文)2.Whatisitscommunicativepurpose?Itspurposeistoexplainwhatthesixthextinctionisanditseffectsandcallonpeopletotakeactiontopreventitfromhappening.1.Whattexttypeisthispieceofwriting?Thispieceofwritingisanexposition.3.Whatwaysofargumentdoesthewriterusetoconvincereaders?Areyouconvinced?Whyorwhynot?·Thewriteruseswayssuchascitingideasfrom

expertsorauthorities,givingexamplesand

usingdata.·Ibelievethatifwetakeactionnowitisnottoolatetosaveotherspeciesfromextinction.Theblackrobinwassavedfromextinctionwhenonlyfivebirdsremained,soIthinkitispossibletosaveanyspeciesifweactrightnow.Doyouknowanyendangeredspecies?Whatshould