Unit 5 Understanding ideas 课件 【教材精讲精研】高中英语外研版（2019）选择性必修第一册

SB1U5RevealingnatureAJourneyofDiscovery(Startingout&Understandingideas)StartingoutActivity1Lookatthepagefromasciencemagazineandanswerthequestions.Whatdoyouknowabouttheseanimals?Whatmakesthemspecial?Whatothersimilaranimalsdoyouknowabout?Shareyourknowledgewiththeclass.Komododragon:ItevolvedinAustraliaandspreadwestward…Duck-billedplatypus:Theoldestdiscoveredfossilofitdatesbacktoabout100,000yearsago…Nautilus:Itoftenconsidered“livingfossils”…Theyareallspeciesthatexitthousandsofyearsonearth;Theyareoldandrare(unusual).StartingoutActivity2Watchthevideoandanswerthequestions.Howcanseedstravel?Howcanthisbenefitplants?Canyouthinkofanotherexampleofseedstravelling?Shareitwiththeclass.Seedsusuallyarecarriedbythewind,water,andanimals.Plantscanhaveabetterchanceatlife.Dandelionseedshavelittleparachutestocatchthewindandgofurther.Humanscanspreadseedsifseedsgetstucktotheirclothingorshoes.UnderstandingideasAJourneyofDiscoveryLeadinAnevolutionarytreelowerformsoflife

higherformsoflife

evolveevolutionWhatspeciesdoyourecogniseinthepicture?Whatfactorscancausetheprocessofevolution?Paramecium,earthworm,snail,crab,fish,tortoise,bird,horse,human,frog...;alga,moss,fern,plant...Theever-changingenvironmentofnature;environmentalchanges;populationimmigration;geneticmutation;culturalpreferences...Whomadethisdiscovery?Whatisthediscovery?Howdidhemakethediscovery?CharlesRobertDarwinThetheoryofevolution

TheOriginofSpeciesPre-readingChoosethemainideaofthepassageandgiveyourreasons.Darwin’sinterestinvariouslivingthingsmadehimagreatnaturalist.Darwin’sjourneyontheBeagleinspiredhisTheoryofEvolution.Darwinwentonajourneytoconfirmhistheorythathumanshadevolvedovertime.Pre-readingWhile-readingReadforstructureHowhemadethediscovery.Para.1Para.2Para.3Para.4Para.5Para.6Para.7IntroductionOnhisjourneyGenerateideasLookformoreevidenceDevelopideasProposeatheoryConclusion

Para

1：Labels

on

a

young

man(intro-duction)incaptain’seyesin

common

people’s

eyesin

his

father'seyesWriting

purpose:

Setthesuspense

to

attract

reader’s

interestsandformastrongcontrast.Hewasnotthecaptain’sfirstchoice.

HewasadisgracetohimselfandallhisfamilyHewasayoungmanwhohadleftmedicalschoolwithoutcompletinghisdegree.While-readingReadfordetailsReadPara.1andchoosethecorrectanswer.1.Whatisthefunctionofpara.1?TopraiseCharlesDarwinToarousereaders’interestsTointroduceCharlesDarwin’sachievementsToinformreadersofCharlesDarwin’slifeWhichofthefollowingstatementsaboutCharlesDarwinisTrue?Darwinwantedtobenefitfromvisitinglittle-knowncountriesDarwinquittedmedicalschoolduetohislackofmoneyDarwin’sfatherwassatisfiedwithDarwinDarwin’smadeasignificantscientificdiscoverythankstohisadventuresontheshipBeagle

Para

2：OnhisjourneywhowhatcollectingsamplesaskinghimselfaquestionCharlesDarwinwasageologistandnaturalist,fascinatedbyrocks,plantsandanimals.Howdiddifferentspeciescometoexist?While-reading

Para

3：Generate

ideasold

ideasnewideaswhathowtoproveAllspecieshadappearedonEarthatthesametime,andhadnotchangedsinceAnimalsevolvedastheyadaptedtotheirchangingenvironmentsTo

look

for

more

evidenceWhile-readingPara

4-5Lookforevidence&Develop

the

ideashowanswerofthatquestionDarwinnoticedfinches’beakshadevolvedaccordingtowhatfoodwasavailableonthatparticularisland.Newspeciesofplantsandanimalsevolvedfromearlierancestors.While-readingPara

6-7Proposeatheory&Concludewhathowpeople'sreactioninfluenceAtheoryofevolutionDarwinexplainedthistheoryinhisbook,OntheOriginofSpecies.OntheOriginofSpeciesisregardedasoneofthemostimportantworkseverwritten.IthaschangedideasaboutlifeonEarthforever.Manypeoplerefusedtobelieve.Theywereshocked.Later,moreandmorepeoplestartedtobelievehistheory.While-readingWhile-readingRetoexist?Maybeanimalsevolvedastheyadaptedtotheirchangingenvironmentstherewasadifferencebetweenthefinchesoneachoftheislands.hadevolvedaccordingtowhatfoodwasavailableonthatparticularislandhadevolvedfromacommonancestor.arrivedontheislandsalongtimebeforehadevolvedfromlowerformsoflifePost-readingSummarize&Retelling12--5Thetextisorganizedinorderof______.Para.___Para._____Para.6-7timeBeforethejourneyDuringthejourneyPost-readingSummarize&RetellingAfterthejourneyaskedhimselfaquestion(generatedanidea)answeredthequestion(developedanidea)publishedthebook(proposedatheory)started

his

journeyIn1831In1835In1859Post-readingRetellingPost-readingWatchandReflectWhatkindofpersonwasDarwinaccordingtothepassage?Whathav