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    冀教版英语九年级Lesson 29 DNA-The Story of You(课件PPT)
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    冀教版九年级上册Lesson 29 DNA—The Story of You优质ppt课件

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    这是一份冀教版九年级上册Lesson 29 DNA—The Story of You优质ppt课件,共41页。PPT课件主要包含了课文呈现等内容,欢迎下载使用。

    Lessn 29 DNA-The Stry f Yu
    Curriculum wrds: blueprint, general, cmplex, twin, cpy, repeat, pattern, identify, related, grandsnUseful expressins: In general, a blueprint is a drawing that shws hw t put a huse tgether with many different parts.
    Functins: Master the new wrds: DNA, blueprint, general, cmplex, twin, cpy, repeat, pattern, identify, related, grandsn, granddaughter, instructin Grammar: except fr的用法Sentences: But building a living thing is far mre cmplex than building a huse.Except fr sme twins, every living thing has its wn unique DNA.
    What d yu knw abut DNA?
    THINK ABOUT IT
    What d yu knw abut DNA?What can scientists d with DNA?
    When yu build a huse,yu use a blueprint. What′s a blueprint?In general,a blueprint is a drawing that shws hw t put a huse tgether with many different parts. DNA is the blueprint f life.
    But building a living thing is far mre cmplex than building a huse. It takes millins f years fr nature t change the DNA in living things t make them fit the wrld they live in. Hw tall are yu?What clur are yur eyes?What size are yur feet? All these things are strngly influenced by yur DNA befre yu are brn!
    DNA is fantastic! ·Except fr sme twins,every living thing has its wn unique DNA. · Sme health prblems can be caused by prblems in yur DNA . Scientists can lk fr these prblems and,smetimes,help yu befre yu becme sick . In the future,scientists might be able t change yur DNA.
    · There are cpies f yur DNA in every part f yur bdy . Fr example, yur finger has the same DNA as yur hair.
    ·Yu have yur wn unique DNA,but it repeats patterns frm yur parents’ DNA. Frm yur DNA,scientists can identify nt nly yu,but als peple wh are related t yu. Yur parents and grandparents are related t yu,and yu have their DNA. When yu have a grandsn r granddaughter,he r she will have yur DNA.
    Yur DNA has billins f instructins that explain why yu are the way yu are. It′s ne f the mst amazing things n the earth!
    Let ′s D It !
    1.What is a blueprint?
    A blueprint is a drawing that shws hw t put a huse tgether with many different parts.
    2.Which is mre cmplex,building a living thing r building a huse?3.D sme twins have the same DNA?
    Building a living thing.
    Yes, they d.
    4.Is it pssible t change yur DNA?5.Whse DNA is related t yurs?
    Yes. In the future, scientists might be able t change ur DNA.
    My parents′ and my grandparents′.
    in general except fr nt nly…but als related t  even if the same…as
    1.Yur hmewrk is quite gd ____________a few spelling mistakes.2.________the yung ________the ld like pp music.
    3.Kate′s hair is__________ clur ______her sister′s.4.___________,wmen live lnger than men.5.________ many difficulties remain,we can vercme them.6.Is wealth ___________ happiness?
    In general 
    A.Their DNA can′t cmbine. B.We can make plants that are bad fr pests. C.They can even cmbine the DNA f a plant and an animal.
    Changing DNA D yu knw DNA can be changed? Have yu ever seen a pig with a dg′s bdy? Of curse nt! Pigs and dgs can′t have babies tgether. ______But nw,scientists can d it.
    Scientists can take DNA , frm ne kind f animal and put it int anther kind f animal. They can design new plants By cmbining the DNA f ther plants.________ Sme scientists are wrried.
    They say we need t knw mre abut DNA befre we start changing it.________ But what if the plants are bad fr humans,t?
    Language pint 1
    d with与deal with都可表示“处理”。 d with常与what连用,而deal with常与hw连用。eg:I dn′t knw what they d with the prblem. 我不知道他们如何处理这个问题。
    Language pint 2
    generally adv.一般地;广泛地;普遍地。generally speaking“大体而言;概括来说”。
    eg:Generally speaking,yur idea is right. 总的来说,你的想法是正确的。eg:In general,their cars are very reliable. 通常,他们的小汽车是很可靠的。
    Language pint 3
    Language pint 4
    (1) nt als...用于连接两个并列的成分,着重强调后者。(连接两个并列的主语) eg:Nt nly Ma Lin but als Ma Lng plays ping­-png very well. 不但马琳而且马龙乒乓球打得也很好。
    (2) nt als...连接两个并列主语时,谓语动词要与它最近的主语保持人称和数上的一致,即“就近原则”。 eg:Nt nly the by but als his parents are staring at the screen. 不但那个男孩而且他的父母也正在盯着屏幕。
    Language pint 5
    ne f… 意为“……之一”,后接可数名词复数作主语时,谓语动词用单数。 如有形容词修饰ne f后的名词时,形容词一般用最高级形式,最高级前应有定冠词the或形容词性物主代词。
    eg:He is ne f my best friends. 他是我最好的朋友之一。 One f my friends lives in Beijing. 我的一个朋友住在北京。
    Language pint 6
    eg: I learn English by listening t the radi. 我通过听收音机学习英语。
    by意为“用来;靠;通过”,表示方式或途径。eg:They make their living by selling fish. 他们以卖鱼为生。
    Yu can imprve yur English ________ practicing mre. A.by        B.with C.f D.in
    【点拨】本题考查介词的用法。 by表示方式,“通过”; with“用;和……在一起”; f“关于;属于……的”; in“在……里”。 由句意“你可以通过多练习提高你的英语。”可知,by表示方式,符合题意。
    一、根据句意及首字母提示完成单词
    1.Lucy and Lily are ______.They lk the same. 2.In ________,wmen d it mre easily than men.3.It′s imprtant fr yu t ________the text.
    4.Mike has a granddaughter and a ________.5.Befre yu take this medicine, yu must read the _____________.
    6.What did the plice ________ that accident? A.deal in  B.deal with  C.d with  D.d abut 7.My article is gd ________sme spelling mistakes. A.except  B.except fr C.Beside   D.besides
    8.Frm yur DNA,scientists can identify yu and the peple ________t yu. A.related B.relates C.relating D.Relate9.Nt nly yu but als he _____ the secret. A.knws B.knw C.have knwn D.t knw
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