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,Unit5LookintoScience,Lesson29DNA-TheStoryofYou,ThisistheshapeofDNA.,“DNA”isshortfordeoxyribonucleicacid.,Doyouthinkitsmagic?,biology,?,生物,?,a?,?,blueprint,計劃，藍(lán)圖,complex,復(fù)雜的，合成的,pattern,模式，圖案，樣品,identify,確定，認(rèn)同,general,一般的，普通的,introduction,指令，命令，指示,related,有關(guān)系的，有關(guān)聯(lián)的，敘述,Readthelessonandanswerthequestions：,Whatisablueprint?Whichismorecomplex,buildingalivingthingorbuildingahouse?DosometwinshavethesameDNA?IsitpossibletochangeyourDNA?WhoseDNAisrelatedtoyours?,Readthelessonandanswerthequestions.(1)Whatisablueprint?(2)Whichismorecomplex,buildingalivingthingorbuildingahouse?(3)DosometwinshavethesameDNA?,Ablueprintisadrawingthatshowshowtoputahousetogetherwithmanydifferentparts.,Buildingalivingthingisfarmorecomplexthanbuildingahouse.,Yes,theydo.,(4)IsitpossibletochangeyourDNA?(5)WhoseDNAisrelatedtoyours?,Yes,itis.Inthefuture,scientistsmightbeabletochangeourDNA.,Peoplewhoarerelatedtome.Forexample,myparentsandgrandparents.,between與amongbetween用于兩者之間，among一般指三者或三者以上。JacksitsbetweenTimandBob.Jack坐在Tim和Bob之間。Shewasamongthecrowd.她處在人群中。,use…todosth.用……做某事Sheisusingaknifetocutvegetables.她正用小刀切蔬菜。use的形容詞是useful.Isthefridgeveryuseful?這臺冰箱很有用嗎？,too與eithertoo與either都表示“也”，其區(qū)別是too用于肯定句，表示“也”；either用于否定句，表示“也不”。他們通常都位于句末，其前用逗號隔開。Hehasababybrother,too.他也有個小弟弟。Hedoesn’thaveaneraser,either.他也沒有橡皮。,own的用法adj.自己的（用在所有格后面，加強(qiáng)語氣）Hemakesallhisownnotebooks.她所有的衣服都是自己做的。vt.有；擁有Whoownsthecar?這輛汽車是誰的？ownern.所有人；物主Sheistheownerofthehouse.她是這座房子的主人。,exceptfor除……以外，只是Davidisagoodmanexceptforhottemper.大衛(wèi)除了脾氣暴躁以外，他是個好人。Theclassroomisniceexceptfordirtyonthefloor.教室除了地板臟以外都很好。,Fillintheblankswiththephrasesinthebox.ingeneral,exceptfor,notonly…butalso,relatedto,evenif,thesame…as…1.Yourhomeworkisquitegoodafewspellingmistakes.2.theyoungtheoldlikepopmusic.3.Kate’shairiscolourhersister’s.4.,womenlivelongerthanmen.5.manydifficultiesremain,wecanovercomethem.6.Iswealthhappiness?,exceptfor,Notonlybutalso,thesameas,Ingeneral,Evenif,relatedto,Completethepassagewiththesentencesinthebox.ChangingDNADoyouknowDNAcanbechanged?Haveyoueverseenapigwithadog’sbody?Ofcoursenot!Pigsanddogscan’thavebabiestogether.________Butnow,scientistscandoit.ScientistscantakeDNAfromonekindofanimalandputitintoanotherkindofanimal.TheycandesignnewplantsbycombiningtheDNAofotherplants.________Somescientistsareworried.TheysayweneedtoknowmoreaboutDNAbeforewestartchangingit.Butwhatiftheplantsarebadforhumans,too?A.TheirDNAcan’tcombine.B.Wecanmakeplantsthatarebadforpests.C.TheycanevencombinetheDNAofaplantandananimal.,A,C,B,IsitagoodideatochangetheDNAofthefoodweeat?Somepeoplesaydoingthismakesourfoodbetter.Othersthinkit’stoodangerous.1.Discusstheideaofyours.2.Writedownyourideas.,Groupwork:,1.Listenandread.2.Finishexercisesofthislesson.,Homework,