Unit5LookintoScienceLesson29DNA－TheStoryofYouFreeTalkBeacuseyourDNAcomesfromyourparents.Doyouknowthereason?DoesCindylooklikehermotherorherfather?Doyoulooklikeyourmotheroryourfather?Lookatthepicture!Thetwogirlslookthesame.Theyaretwins.FreeTalkBeacusetheyhavethesameDNA.Doyouknowwhytheyarethesame?WhatisDNA?FreeTalk“DNA”isshortfordeoxyribonucleicacid.

脫氧核糖核酸[di:'?ksi,raib?unju:'kli:ik]ThefunctionofDNAistostoregeneticinformation.genetic遺傳的ThisistheshapeofDNA.LeadinHowtallareyou?Whatcolourareyoureyes?Whatsizeareyourfeet?Doyouthinkit’smagic?

AllthesethingsarestronglyinfluencedbyyourDNAbeforeyouareborn!Let'slearnanewlessonandfindouthowfantasticDNAis!ListenandfollowNewWordsIfyouwanttomakeacar,youshouldknowa_________ideaofhowacarworks.generalgeneral

adj.

一般的;普遍的ingeneral=generallyspeaking意思是“一般而言;通?！盜ngeneral,womencrymoreeasilythanmen.NewWordsThisisping-pongworldchampionLiuGuoliang.Theothersare_______tohim,theyarehiswifeandtwodaughters.relatedberelatedto“與......相關(guān)”Thematterisrelatedtohim.NewWordsTheyare____________forpublicplaces.instructionsinstructionn.指示;說明Fillintheblankswiththephrasesinthebox.

ingeneral

exceptfor

notonly…butalsorelatedto

evenif

thesame…as1．Yourhomeworkisquitegood__________afewspellingmistakes.2．________theyoung________theoldlikepopmusic.3．Kate’shairis________colour______hersister's.4．___________,womenlivelongerthanmen.5．________manydifficultiesremain,wecanovercomethem.6．Iswealth_________happiness?Evenif

relatedtothesameIngeneral

exceptfor

Notonlybutalsoas

ExercisesReadthelessonandanswerthequestions.1．Whatisablueprint?2．Whichismorecomplex,buildingalivingthingorbuildingahouse?3．DosometwinshavethesameDNA?Ablueprintisadrawingthatshowshowtoputahousetogetherwithmanydifferentparts.

Buildingalivingthing.Yes,theydo.ReadingtasksReadthelessonandanswerthequestions.4．IsitpossibletochangeyourDNA?5．WhoseDNAisrelatedtoyours?

Yes.Inthefuture,scientistsmightbeabletochangeourDNA.

Peoplewhoarerelatedtome.Forexample,myparentsandgrandparents.Readingtasks6．WhatarefantasticfactsaboutDNA?Readingtasks

Exceptforsometwins,

everylivingthinghasitsownuniqueDNA.

SomehealthproblemscanbecausedbyproblemsinyourDNA.

TherearecopiesofyourDNAineverypartofyourbody.

YouhaveyourownuniqueDNA,butitrepeatspatternsfromyourparents’DNA.Heisagoodmanexceptforabadtemper.他是個好人,除了有點脾氣壞。WeallwenttothezooexceptLiMing.除了李明以外,我們都去了動物園。Nobodywastherebuthimintheroom.除他之外,大家都不在。HealsoknowsJapanesebesidesEnglish.除了懂英語之外,他也懂日語。LanguagePointstemper性情；脾氣，（

只是主語的一個細節(jié)）。

LiMing被排除在外。

多用在no,nobody,who,where,all等詞之后

。除了英語之外還有日語。[辨析]各種各樣的“除外”except意為“除了”,表示從整體中除去,不包括所除事物在內(nèi),除去的和非除去的是同類事物。一般不用于句首。exceptfor意為“除了”,說明整個基本情況后,對細節(jié)加以糾正,其后一般接名詞或名詞性短語。besides意為“除了……之外還有”,包括所“除”的事物在內(nèi)。but意為“除……外”,多用在no,nobody,who,where,all等詞之后。LanguagePointsCompletethepassagewiththesentencesinthebox.ChangingDNADoyouknowDNAcanbechanged?Haveyoueverseenapigwithadog’sbody?Ofcoursenot!Pigsanddogscan’thavebabiestogether.______Butnow,scientistscandoit.ScientistscantakeDNA,fromonekindofanimalandputitintoanotherkindofanimal.TheycandesignnewplantsBycombiningtheDNAofotherplants.________Somescientistsareworried.TheysayweneedtoknowmoreaboutDNAbeforewestartchangingit.________Butwhatiftheplantsarebadforhumans,too?C

BA

ReadingtasksIsitagoodideatochangetheDNAofthefoodweeat?Somepeoplesaydoingthismakesourfoodbetter.Othersthinkit’stoodangerous.SearchtheInternetforinformationandwritedownyourideas.Dividethestudentsintotwogroups.OnegroupsupportitisagoodideatochangetheDNAofthefoodweeat.TheothergroupsaysomethingaboutthedisadvantagesofchangingtheDNAofthefood.GroupWorkDNAblueprinttwingeneralrepeatcomplexpatternidentifyrelatedgrandsongranddaughterins