Unit3 The return of the dinosaur 課件-高中英語人教版選修八

Learningaims:Comprehend

thepassageWriteasummaryofit.Readthefirstparagraph:WhydidtheauthormentionJurassicParkinthefirstparagraph?

Whichsentencecanserveasthetopicsentenceofthisparagraph?To

introduce/leadin

the

topicandattractreaders’attentionButinfact,wearealongwayfrombeingabletocloneextinctanimals.Westillhavealotofworktodo…Itisdifficult…Itisnotlikely…Readthesecondparagraph:Whataretherequirementsforcloningextinctanimals?____________forcellstogrowEnough_________forgroupsto_____________________________forthemtoliveinWithwhatweknownow,thisiseitherimpossibleorunsuitablePerfectDNAdiversityresistdiseasesSuitablehabitatsAllthesearedifficulttogetnotes:diversityinagroup群體的多樣性theabilitytoresistthedisease抗疫力Thegreatdrawbacktocloningagroupofanimalsisthattheywouldall

havethesamearrangementofgenesandsomightdieofthesameillness.

經(jīng)過克隆的動(dòng)物群體的最大缺點(diǎn)是：它們的基因排列有可能完全相同，

因而它們有可能會(huì)死于同一種疾病。Thereshouldbeenoughgeneticvariation

inthegrouptobeabletoresistnewillnesses.

1.Whycan’tyouclonetheDNAofanimalsthathavebeenextinctlongerthan10,000years?2.Whydidtheauthoremphasize“with/basedonwhatweknownow”againandagain?3.Conclusion:Thechanceofdinosaursreturningtotheearthismerelyadream.Readthethirdparagraph:Tomakehisargumentmoreaccurate.Itiscompletelyimpossible…Wewilldefinitelynever…Itcan’tsurvivesolong.Writeasummaryofthepassage!GeneralideasSentencepatterns1Thepossibilityof_______________________________2The_______whyit’simpossibleandunsuitable3Another______andtheconclusioncloningextinctanimalslikedinosaursThough/despite…Itis/weare…reasonsreasonThisisbecause……mayaccountfor…Besides/inaddition…Therefore…TipsforsummarywritingFindoutgeneralideasofeachpartandruleouttheunimportantdetails.Expressyourideasinyourownwordsbychangingthesentencepatternsandreplacingwordsandphrases.Betruthfulabouttheauthorandhispassage.

Though

theideaofcloningextinctanimalslikedinosaursmaybeattractive,itisstillverydifficulttoattainit.ThisisbecauseperfectDNAneededforcellstogrow,diversityforgroupstodefenddiseasesandsuitablehabitatsforthemarenotlikelytobeobtained.Besides,dinosaursdisappear