九年级英语上册Unit5LookintoScienceLesson29DNA_TheStoryofYou教学课件新版冀教版.ppt

,Unit5LookintoScience,Lesson29DNA-TheStoryofYou,ThisistheshapeofDNA.,“DNA”isshortfordeoxyribonucleicacid.,Doyouthinkitsmagic?,biology,生物,a,blueprint,计划，蓝图,complex,复杂的，合成的,pattern,模式，图案，样品,identify,确定，认同,general,一般的，普通的,introduction,指令，命令，指示,related,有关系的，有关联的，叙述,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与amongbetween用于两者之间，among一般指三者或三者以上。JacksitsbetweenTimandBob.Jack坐在Tim和Bob之间。Shewasamongthecrowd.她处在人群中。,usetodosth.用做某事Sheisusingaknifetocutvegetables.她正用小刀切蔬菜。use的形容词是useful.Isthefridgeveryuseful?这台冰箱很有用吗？,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。Hehasababybrother,too.他也有个小弟弟。Hedoesnthaveaneraser,either.他也没有橡皮。,own的用法adj.自己的（用在所有格后面，加强语气）Hemakesallhisownnotebooks.她所有的衣服都是自己做的。vt.有；拥有Whoownsthecar?这辆汽车是谁的？ownern.所有人；物主Sheistheownerofthehouse.她是这座房子的主人。,exceptfor除以外，只是Davidisagoodmanexceptforhottemper.大卫除了脾气暴躁以外，他是个好人。Theclassroomisniceexceptfordirtyonthefloor.教室除了地板脏以外都很好。,Fillintheblankswiththephrasesinthebox.ingeneral,exceptfor,notonlybutalso,relatedto,evenif,thesameas1.Yourhomeworkisquitegoodafewspellingmistakes.2.theyoungtheoldlikepopmusic.3.Kateshairiscolourhersisters.4.,womenlivelongerthanmen.5.manydifficultiesremain,wecanovercomethem.6.Iswealthhappiness?,exceptfor,Notonlybutalso,thesameas,Ingeneral,Evenif,relatedto,Completethepassagewiththesentencesinthebox.ChangingDNADoyouknowDNAcanbechanged?Haveyoueverseenapigwithadogsbody?Ofcoursenot!Pigsanddogscanthavebabiestogether._Butnow,scientistscandoit.ScientistscantakeDNAfromonekindofanimalandputitintoanotherkindofanimal.TheycandesignnewplantsbycombiningtheDNAofotherplants._Somescientistsareworried.TheysayweneedtoknowmoreaboutDNAbeforewestartchangingit.Butwhatiftheplantsarebadforhumans,too?A.TheirDNAcantcombine.B.Wecanmakeplantsthatarebadforpests.C.TheycanevencombinetheDNAofaplantandananimal.,A,C,B,IsitagoodideatochangetheDNAofthefoodweeat?Somepeoplesaydoingthismakesourfoodbetter.Otherst