1、Lesson 29 DNA-The Story of You教学目标：通过自主探究，合作交流的模式，理解课文大意，掌握语言知识点以及用法。教学重点和难点：1 理解课文大意2 掌握下列短语:in general , except for, be related to, not onlybutalso, 3 理解下列句子：(1) In general, blueprint is a drawing that shows how to put a housetogether with many different parts.(2) It takes millions of years for na
2、ture to change the DNA in livingthings to make them fit the world they live in.(3) All these things are strongly influenced by your DNA before youare born.(4) Your DNA has billions of instructions that explain why you arethe way you are.教学过程：Step 1 GreetingStep 2 Lead inAsk students the following qu
3、estions : “Do you know DNA ? Howmuch do you know about DNA? What can we do by DNA?”1When the lost children are found, we can tell who are their parents.2 DNAcan help the police catch the bad man.3 People are often ill. We can prevent some illness by DNA. We canlive longer.4 The scientists can study
4、the people long long ago.Do you know why we can do these things? Lets find out the answerin Lesson 29.Step 3 Learn the new words in groups and then ask some students toread the new words. And then give the students one minute to ask thestudents to remember the all the new students. Then do some exer
5、cises.1 She had a confused idea of life in_general_(一般的).2 Could you_repeat_(重复) that question for me?3 Please follow his_pattern_(模式) to do it.4 Our culture is _more complex_(复杂的) than he knows.5 Would you be able to_identify_(辨别) the man who robbedyou ?6 please look at the _instruction_(说明)before
6、you take themedicine.Step 4 Listen to the tape and write T or F（初步感知课文）( T ) 1Ablueprint shows where to put all the parts of the house.( T ) 2 You can know what size your feet are with DNA.( F ) 3 Every living thing has the same DNA.( F ) 4 Your DNAis different in every part of your body.( F ) 5 You
7、r DNAis different from your parents.Step 5 Lets Do It ! No.1 Read the lesson and answer the questions.（了解课文大概内容）1 What is a blueprint?A blueprint is a drawing that shows how to put a house together withmany different parts.2 Which is more complex, building a living or building a house?Building a liv
8、ing is more complex.3 Do some twins have the same DNA? Yes.4 Is it possible to change your DNA? Yes .5 Whose DNAis related to yours? People who are related to you.Step 6 讲解课文中的重点知识点。 in general, except for, be relatedto, not onlybut also1in general 意思是“一般而言；概括说来（通常置于句首）”。也可以用 generally speaking 来表示。
9、例如： In general / Generally speaking, women cry more easily thanmen.2 except for 用于表示对整体的肯定和局部的否定。例如：Smith is a good man, except for his bad temper. 史密斯除了脾气不好之外是个好人。The movie was good except for the ending.这部电影除了结尾之外都好。(1)The city is good _except for_the weather.(2)We all went to the zoo_except_Li Mi
10、ng.(3)He also knows Japanese_besides_English3 be related to 意思是“与有关，使互相关联” 也可以用 relate to表示。例如：The matter is related to him. The matter relates to him.4 not onlybut also 意思是“不但而且”，连接两个相同的成分，也可以连接两个分句。连接两个并列主语的时候，谓语动词和最近的主语一致。例如：He likes not only English but also math.Not only you but also I am a tea
11、cher.Step 7 Lets Do It ! No.2 (巩固所学知识点)Step 8 小组合作翻译课文中的重点句子。 （再次加深对课文的理解）1 In general, a blueprint is a drawing that shows how to put a housetogether with many different parts.通常来说， 蓝图就是用来展示如何将许多不同部分组建成一幢房子的图纸。2 It takes millions of years for nature to change the DNA in livingthings to make them fi
12、t the world they live in.自然界需要花费百万年来改变生物的 DNA，使其适应所生活的世界。3 All these things are strongly influenced by your DNA before youare born.这些在你出生之前，就深受你的 DNA 的影响。4 Your DNA has billions of instructions that explain why you are theway you are.你的 DNA 有着数十亿的指令，解释着你为什么呈现出当前你的模样。Step 9 Read the lesson in groups
13、and then ask some students to readthe lesson .同时检查对课文还有无疑问。Step 10 Why can we do these things by DNA?1 Childrens DNArepeats from their parentsDNA.2 Except for some twins,every living thing has its own unique DNA.3 Some health problems can be caused by problems in our DNA.Scientists can look for these problems and sometimes help us before webecome sick.Step 10 Homework：Make a summary “What do you know aboutDNA?”
