Unit 5 Look into Science.Lesson 29 DNA—The Story of You教案

Lesson29 DNA---The Story of You教学设计
课题 Lesson29 DNA---The Story of You 课型 New 课时 One
教学目标 知识目标:Words and expressions能力目标:Understand the articles about DNA.德育目标:You are unique in the world.
教学重点 一、重点词汇blueprint, general, ( http: / / www.21cnjy.com )complex, twins, pattern, identify, be related to, except for.二、重点句型1. In general, a blue ( http: / / www.21cnjy.com )print is a drawing that shows how to put a house together with many different parts.2. It takes millions ( http: / / www.21cnjy.com )of years for nature to change the DNA in living things to make them fit the world they live in.
教学难点 定语从句.
教法 Listen, ask and answer.
学法 Listen, answer and write.
教具 tape slides
板书设计 Lesson 29定语从句定语从句的概念定语从句的关系词课本中的例句例1：In general ( http: / / www.21cnjy.com ), a blueprint is a drawing that shows how to put a house together with many different parts.例2：It takes million ( http: / / www.21cnjy.com )s of years for nature to change the DNA in living things to make them fit the world they live in.
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Step 1.Greetings.设计意图：让学生做好上课的准备。Step 2. Think about it.1. What do you know about DNA 2. What can scientists do with DNA 设计意图：与学生进行一个简短的对话，进入本课主题。Step 3. Show stud ( http: / / www.21cnjy.com )ents some pictures to let them know something about DNA and the new words in this lesson.设计意图：通过展示图片让学生了解本课重点单词及DNA的知识。Step 4. Read the lesson and answer the questions.1. What is a blueprint 2. Which is more ( http: / / www.21cnjy.com )complex, building a living thing or building a house 3. Do some twins have the same DNA 4. Is it possible to change your DNA 5. Whose DNA is related to yours 设计意图：让学生带着任务读课文。Step 5. Language Points1. Are there differences between you and them 你和他们之间有什么不同吗 【辨析】between与amongbetween常用于两者之间，among一般指三者或三者以上.Jack sits between Lin Tao and Bob.I was among the crowd. 我处在人群中。2.You use it to build a house.你用它来建造房子。use的用法 use…to do sth. 用……做某事He is using a knife to cut bread. 他正用小刀切面包。【注意】 use的形容词是useful，它是由use加后缀-ful构成的。如：Is the fridge very useful 这台冰箱很有用吗？3. DNA is a pattern, too. DNA也是一种模型。 too表示“也”时,通常置于句末，其前用逗号隔开。【辨析】too与either too与either都表示“也”，其区别是 ( http: / / www.21cnjy.com )too用于肯定句，表示“也”；either用于否定句，表示“也不”。它们通常都位于句末，其前用逗号隔开。如：He has a sister, too. 他也有个小妹妹。He doesn’t have a knife, either. 他也没有小刀。4. Except for ( http: / / www.21cnjy.com ) identical twins, each living thing has its own unique DNA. 除了每对双胞胎之外，每个生物都有它唯一的DNA。1)except for除……以外，只是He is a good man except for hot temper. 除了脾气暴躁外，他是个好人。2)own的用法adj. 自己的（用在所有格后面，加强语气） She makes all her own clothes. 她所有的衣服都是自己做的。vt. 有；拥有 Who owns the bike 这辆自行车是谁的？【友情提示】owner n. 所有人；物主He is the owner of the house. 他是这座房子的主人。设计意图：通过教师讲解让学生对重点知识更加熟悉。Step 6. Do some exercises.设计意图：通过练习让学生巩固本课的重点知识。 Try to answer the two questions.Relate pictures to the new words.Read the text aloud and answer the questions.Let the students write the important language down.Students do some exercises.
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矫正反馈
Step 7. HomeworkMake a summaryWhat have you known about “DNA” now What can scientists do with DNA
课堂测试题 一、用所给词的适当形式填空。1. This is t ( http: / / www.21cnjy.com )he __________(identify) hotel that we stayed in last year.2. Your brothers are people _________(relate) to you.3. Do you know who is the _________(own) of the house 4. Your body uses this pattern _________ (build) itself.5. You have your ow ( http: / / www.21cnjy.com )n DNA, but it repeats the patterns from your ______(parent) DNA. 6. Some health prob ( http: / / www.21cnjy.com )lems come from your family’s DNA.______(science) can look for these problems in your DNA.二、根据汉语意思完成句子，每空一词：1. 我们用蓝图建造房子。 We _______ a blueprint ______ _______ a house.2. 除了窗子小外这座房子很漂亮。 The house is beautiful ______ _____ the small windows.3. 你的头发和皮肤有同样的DNA。 Your hair has ______ _______ _______ _____ your skin.4. 她不但会唱歌，而且会跳舞。 She can _____ ______ sing ______ ________ dance.
教学反思