Lesson29DNA---TheStoryofYouThinkaboutit!1.WhatdoyouknowaboutDNA?2.WhatcanscientistsdowithDNA?Presentation:ThisistheshapeofDNA.Doyouthinkit’smagic?“DNA”isshortfordeoxyribonucleicacid.Thetwogirlsaretwins.MaybetheyhavetheidenticalDNA.[identical（adj)-----identify(v.)]Why?FangZuminglookslikehisfather—ChengLong.Readthelessonandanswerthequestions：1.Whatisablueprint?2.Whichismorecomplex,buildingalivingthingorbuildingahouse?3.DosometwinshavethesameDNA?4.IsitpossibletochangeyourDNA?5.WhoseDNAisrelatedtoyours?LanguagePoints:1.Aretheredifferencesbetweenyouandthem?你和他们之间有什么不同吗?【辨析】between与amongbetween常用于两者之间，among一般指三者或三者以上.JacksitsbetweenLinTaoandBob.Iwasamongthecrowd.我处在人群中。2.Youuseittobuildahouse.你用它来建造房子。use的用法use…todosth.用……做某事Heisusingaknifetocutbread.他正用小刀切面包。【注意】use的形容词是useful，它是由use加后缀-ful构成的。如：Isthefridgeveryuseful?这台冰箱很有用吗？3.DNAisapattern,too.DNA也是一种模型。too表示“也”时,通常置于句末，其前用逗号隔开。【辨析】too与eithertoo与either都表示“也”，其区别是too用于肯定句，表示“也”；either用于否定句，表示“也不”。他们通常都位于句末，其前用逗号隔开。如：Hehasasister,too.他也有个小妹妹。Hedoesn’thaveaknife,either.他也没有小刀。4.Exceptforidenticaltwins,eachlivingthinghasitsownuniqueDNA.除了同卵双胞胎之外，每个生物都有它唯一的DNA。1)exceptfor除……以外，只是Heisagoodmanexceptforhottemper.除了脾气暴躁外，他是个好人。2)own的用法adj.自己的（用在所有格后面，加强语气）Shemakesallherownclothes.她所有的衣服都是自己做的。vt.有；拥有Whoownsthebike?这辆自行车是谁的？【友情提示】ownern.所有人；物主Heistheownerofthehouse.他是这座房子的主人。Practice:Fillineachblankwiththeproperword.1.Thisisthe__________(identify)hotelthatwestayedinlastyear.2.Yourbrothersarepeople_________(relate)toyou.3.Doyouknowwhoisthe_________(own)ofthehouse?4.Yourbodyusesthispattern_________(build)itself.5.YouhaveyourownDNA,butitrepeatsthepatternsfromyour__________(parent)DNA.6.Somehealthproblemscomefromyourfamily’sDNA._________(science)canlookfortheseproblemsinyourDNA.identicalrelatedownertobuildparents’Scientists根据汉语意思完成句子，每空一词：1.我们用蓝图建造房子。We_______ablueprint_____________ahouse.2.除了窗子小外,这座房子很漂亮。Thehouseisbeautiful___________thesmallwindows.3.你的头发和皮肤有同样的DNA。Yourhairhas_________________________yourskin.4.她不但会唱歌，而且会跳舞。Shecan___________sing______________dance.usetobuildexceptforthesameDNAasnotonlybutalsoHomeworkMakeasummaryWhathaveyouknownabout“DNA”now?WhatcanscientistsdowithDNA?
