新冀教版九年级全一册英语Lesson 29 DNA－The Story of You课件

1、Lesson 29 DNAThe Story of You Unit 5 Look into Science 学习目标Curriculum words: blueprint, general, plex, twin, copy, repeat, pattern, identify, related, grandsonUseful expressions: In general, a blueprint is a drawing that shows how to put a house together with many different parts.Functions: Master t

2、he new words: DNA, blueprint, general, plex, twin, copy, repeat, pattern, identify, related, grandson, granddaughter, instruction Grammar: except for的用法Sentences: But building a living thing is far more complex than building a house.Except for some twins, every living thing has its own unique DNA.思

3、考新课导入思 考What do you know about DNA?新课讲解THINK ABOUT ITWhat do you know about DNA?What can scientists do with DNA? When you build a house，you use a blueprint. Whats a blueprint？In general，a blueprint is a drawing that shows how to put a house together with many different parts. DNA is the blueprint of

4、 life.课文呈现新课讲解 But building a living thing is far more plex than building a house. It takes millions of years for nature to change the DNA in living things to make them fit the world they live in. How tall are you？What colour are your eyes？What size are your feet? All these things are strongly influ

5、enced by your DNA before you are born! DNA is fantastic! Except for some twins，every living thing has its own unique DNA.新课讲解 Some health problems can be caused by problems in your DNA.Scientists can look for these problems and，sometimes，help you before you be e sick.In the future，scientists might b

6、e able to change your DNA.There are copies of your DNA in every part of your body.For example，your finger has the same DNA as your hair.新课讲解 You have your own unique DNA，but it repeats patterns from your parents DNA. From your DNA，scientists can identify not only you，but also people who are related

7、to you. Your parents and grandparents are related to you，and you have their DNA. When you have a grandson or granddaughter，he or she will have your DNA. Your DNA has billions of instructions that explain why you are the way you are. Its one of the most amazing things on the earth!新课讲解This is the sha

8、pe of DNA. Do you think its magic?Your DNA es from your parents.新课讲解Let s Do It !Read the lesson and answer the questions.11What is a blueprint?2Which is more plex，building a living thing or building a house?3Do some twins have the same DNA?A blueprint is a drawing that shows how to put a house toge

9、ther with many different parts. Building a living thing. Yes, they do. 新课讲解4Is it possible to change your DNA?5Whose DNA is related to yours? Yes. In the future, scientists might be able to change our DNA. My parents and my grandparents. 新课讲解Fill in the blanks with the phrases in the box.2 in genera

10、lexcept fornot onlybut also related to even ifthe sameas1Your homework is quite good _a few spelling mistakes.2_the young _the old like pop music.3Kates hair is_ colour _her sisters.4_，women live longer than men.5_ many difficulties remain,we can over e them.6Is wealth _ happiness?except for Not onl

11、ythe sameIn general Even if related to but also as 新课讲解3 plete the passage with the sentences in the box.Changing DNA Do you know DNA can be changed? Have you ever seen a pig with a dogs body? Of course not! Pigs and dogs cant have babies together. _But now，scientists can do it. Scientists can take

12、DNA , from one kind of animal and put it into another kind of animal. They can design new plants A新课讲解By bining the DNA of other plants._ Some scientists are worried. They say we need to know more about DNA before we start changing it._ But what if the plants are bad for humans，too?C B ATheir DNA ca

13、nt combine.BWe can make plants that are bad for pests.CThey can even combine the DNA of a plant and an animal.新课讲解4Is it a good idea to change the DNA of the food we eat? Some people say doing this makes our food better. Others think its too dangerous. Search the Inter for information and write down

14、 your ideas.新课讲解 do with 处理 PointLanguage point 1do with与deal with都可表示“处理”。do with常与what连用，而deal with常与how连用。eg：I dont know what they do with the problem. 我不知道他们如何处理这个问题。新课讲解 in general 通常；大体上PointLanguage points 2generally adv.一般地；广泛地；普遍地。generally speaking“大体而言；概括来说”。eg：Generally speaking，your ide

15、a 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。新课讲解 辨析 except，except for，besides与but PointLanguage points 3except 意为“除了”，表示从整体中除去，不包括所除事物在内，除去的和非除去的是同类事物。一般不用于句首。 except for 意为“除了”，说明整个基本情况后，对细节加以纠正，其后一般接名词或名词性短语。 besides 意为“除了之外还有”，包括所“除”的事物在内。 but 意为“除外”，多用在no

16、，nobody，who，where，all等词之后。新课讲解 not only.but also.不但而且 PointLanguage points 4（1）not only.but also.用于连接两个并列的成分，着重强调后者。eg：Not only Ma Lin but also Ma Long plays pingpong very well. 不但马琳而且马龙乒乓球打得也很好。 (连接两个并列的主语)（2）not only.but also.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：Not only the boy but also hi

17、s 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。新课讲解 one of 之一 PointLanguage points 5one of 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one of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 one of my best friends. 他是我最好的朋友之一。 One of my friends lives in Beijing. 我的一个朋友住在北京。新课讲解by/ba/ prep. 通过 PointL

18、anguage points 6eg：I learn English by listening to the radio. 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。新课讲解典例You can improve your English _ practicing more.(重庆A)AbyBwithCof Din【点拨】本题考查介词的用法。by表示方式，“通过”； with“用；和在一起”；of“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

19、知，by表示方式，符合题意。 A当堂小练一、根据句意及首字母提示完成单词 1Lucy and Lily are _They look the same. 2In _，women do it more easily than men. 3. Its important for you to _the text. 4Mike has a granddaughter and a _ 5Before you take this medicine, you must read the _.eneral wins epeat randson nstructions当堂小练二、单项选择6What did the police _ that a ident? Adeal in Bdeal with Cdo with Ddo about 7My article is good _some spelling mistakes. Aexcept Bexcept for CBeside Dbesides CB新课讲解8From your DNA，scientists can identify you and the pe