Unit 5 Understanding ideas高中英语课件

Unit5Revealingnature

Understandingideas

新标准《英语》高中选择性必修第一册Activity1Lookattheevolutionarytreeandanswerthequestions.1Whatspeciesdoyourecogniseinthepicture?Paramecium,earthworm,snail,crab,fish,tortoise,bird,horse,human,frog...;alga,moss,fern,plant...2Whatfactorscancausetheprocessofevolution?Theever-changingenvironmentofnature;environmentalchanges;populationimmigration;geneticmutation;culturalpreferences...Activity2Readthepassageandtalkaboutyourunderstandingofthetitle.Activity2Mostcommonly,peoplebelievethatajourneymeansatripfromoneplacetoanother,especiallyoveralongdistanceandliterarilyajourneyreferstotheprocessbywhichsomethinggraduallychangesanddevelops.ThetitlemayindicatethatDarwin’sresearchworkleadingtohisdiscoveryofevolutionandtheoriginofspeciestookquitealongtimeandgreatefforts,determinationandcouragetoachieve.Activity3Choosethemainideaofthepassageandgiveyourreasons.1.Darwin’sinterestinvariouslivingthingsmadehimagreatnaturalist.2.Darwin’sjourneyontheBeagleinspiredhisTheoryofEvolution.3.Darwinwentonajourneytoconfirmhistheorythathumanshadevolvedovertime.Thetitleofthepassageis“ajourneyofdiscovery”.SothepassageismainlyabouthowDarwin’sTheoryofEvolutiongeneratedanddevelopedonhisjourneyontheBeagle.Activity4Numberthepuzzlepiecesinorder.Organiseinformationfromthepassageandcompletethem.142351OnhisjourneyontheBealge:

variouslivingthingsintheirnaturalenvironmentsandsamplesoftheplantsandanimalshehadcollected.verysimilartoeachother.2Generateideas•cometoexist?•Maybeanimalsevolvedastheyadaptedtotheirchangingenvironments？3Lookformoreevidencethattherewasadifferencebetweenthefinchesoneachoftheislands.hadevolvedaccordingtowhatfoodwasavailableonthatparticularisland.4Developideashadevolvedfromacommonancestor,whichhadarrivedontheislandsalongtimebeforeslowlyevolvedintomanynewspecies.5Proposeatheory•hadevolvedfromlowerformsoflife.Activity4NowdiscusswhyDarwindidnotpublishhisTheoryofEvolutionuntil1859,abouttwentyyearsafterhisdiscovery？Dofurtherresearchifnecessary.1.Atthattime,manypeoplebelievedthatallspecieshadappearedonEarthatthesametimeandhadnotchangedsince,butDarwin’stheoryproposedthatlivingthings,includinghumans,hadevolvedfromlowerformsoflife,which,asaresult,shockedmany