Lesson29DNA—TheStoryofYouLookintoScienceUnit5

Lookatthepicture.Whatyoufind?Thegirllookslikehermother.Theboylookslikehisfather.YourDNAcomesfromyourparents.Whydotheylookthesame?ThisistheshapeofDNA.Doyouthinkit’smagic?“DNA”isshortfordeoxyribonucleicacid.blueprintgrandsongranddaughtertwinThey’retwins.instructionblueprintgeneral complex twinrepeatpattern n.

藍圖adj.一般的；普通的adj.

復雜的n.雙胞胎之一v.

重復;復述;背誦n.模式；形式identifyrelatedgrandsongranddaughterinstructionv.確認；鑒別 adj.

指示；說明n.孫子；外孫n.孫女；外孫女n.

指示；說明Readthetitleandlookatthepictureinthebook.WhatdoyouknowaboutDNA?DNAisaboutyourself.It’sshapeisspecialandmagic.Readthefirstpartofthepassageandanswer.1.Whatisablueprint?2.Whatistheblueprintoflife?It’sadrawingthatshowshowtoputahousetogetherwithmanydifferentparts.DNA.3.Whichismorecomplex,buildingalivingthingorbuildingahouse?Why?4.Beforeweareborn,whatcanbeinfluencedbyourDNA?Buildingalivingthingisfarmorecomplex.BecauseittakesmillionsofyearsfornaturetochangetheDNAinlivingthingstomakethemfittheworldtheylivein.Ourheight,thecolourofoureyes,thesizeofourfeet.Readthesecondpartofthepassageandanswer.1.DosometwinshavethesameDNA?2.Whatmightthescientistshelpwithyourhealthproblemsinthefuture?Yes,theydo.TheymightbeabletochangeyourDNAbeforeyougetsick.3.WherearecopiesofyourDNA?4.WhoseDNAisrelatedtoyours?Ineverypartofourbodies.Peoplewhoarerelatedtome.Forexample,myparentsandgrandparents.Readthemindmap.Thenretell.1.Butbuildingalivingthingisfarmorecomplexthanbuildinga

house.但創(chuàng)造一個生物比蓋房子要復雜得多。far用于比較級表示程度，這樣的詞語還有much、still、even、no、alittle、abit、alot、rather、any等。Theroomisabitlargerthanthatone.這個房間比那個稍大一點。Heworksstillharderthanever.他比以往更加努力學習了。Mattersarealotbetterthaneverbefore.情況遠遠比以前好。Canhejumpanyhigher?他能跳得更高一些嗎？LessonOneismucheasierthanLessonTwo.第一課比第二課容易得多。Tomlooksevenyoungerthanbefore.湯姆看上去甚至比以前還年輕。2.Exceptforsometwins,everylivingthingshasitsownuniqueDNA.除了同卵雙胞胎之外，每個生物都有自己獨特的DNA。辨析：except、exceptfor、besides與butexcept除……之外，不包括后面提到的內容。exceptfor除……之外，除去整體中的一部分，前后為不同類。besides除……之外還有，包含后面提到的內容but除……之外，通常與nothing、nobody、no等否定詞連用WeallwenttothezooexceptLiMing.除了李明，我們都去了動物園。Theshirtlooksgoodexceptforitscolour.這件襯衫除了顏色，還不錯。Ihavetwobooksbesidesthisone.除了這本，我還有兩本。（共三本）Thereisnothingbutadeskhere.這里除了一張桌子外什么也沒有。3.FromyourDNA,scientistscanidentifynotonlyyou,butalsopeoplewhoarerelatedtoyou.從你的DNA中，科學家們不但能夠辨認出你，而且能夠辨認出和你有血緣關系的人。

(be)relate

to/with表示“與……有關”。Heisrelatedtomyfamily.他與我的家庭有關系?！就卣埂縭elate動詞，意為“把……聯(lián)系起來”。Thematterrelatestohim.這事與他有關。Ican’trelatewhathedoeswithwhathesays.我無法把他的言行聯(lián)系起來。4.Read,findandtranslate.一般而言，通常把……組裝在一起……和……一樣……除了不但……而且……和……有關

數(shù)十億的ingeneralput…together…thesame…as…exceptfornotonly…butalso…berelatedtobillionsofIsitagoodideatochangetheDNAofthefoodweeat?Somepeoplesaydoingthismakesourfoodbetter.Othersthinkit’stoodangerous.SearchtheInternetforinformationandwritedownyourideas.完成句子，每空一詞。1.輕工業(yè)和農業(yè)密切相關。

Lightindustryisclosely________________agriculture.2.除了窗子小外,這座房子很漂亮。

Thehouseisbeautiful___________thesmallwindows.3.你的頭發(fā)和皮膚有同樣的DNA。

Yourhairhas_________________________yourskin.4.她不但會唱歌，而且會跳舞。

Shecan___________sing______________dance.relatedtoexcept