2015秋冀教版英语九上Unit 5《Lesson 29 DNA—The Story of You》随堂练习

Unit 5 Look into ScienceLesson 29 DNA-The Story of You1. Analysis of the StudentsThe students of Grade 9 have mastered certain vocabularies，expressions and structures. They also have the abilities of self-teaching and working in groups. Most of them are willing to express their opinions in English.2. Analysis of Teaching ContentLesson 28 is the fifth lesson in Unit 5, Book 5.This unit focus on the subject Look into science, also teach the students something about science. Students cares about the subject because it is close to everyone. Lesson 28 mainly talks about DNA, it tell us the character and function of DNA, also understand our body. We are unique in the world.【知识目标】1.To master the words: blueprint, general, complex, twins, pattern, identify, be related to, except for.2. To master the phrases: not only…but also, except for, be related to, billions of.【能力目标】Improve the students’ ability of speaking, listening, reading and writing. Understand the articles about DNA.【情感目标】Know more about the nature, know more about our body. You are unique in the world. 【教学重点】To master the compound sentences.【教学难点】To master the use of DNA.Tape recorder, MultimediaStep 1. Warm-upFree talk: (show the picture of DNA, tell students DNA is short for deoxyribonucleic acid.)Think about it!1. What do you know about DNA?2. What can scientists do with DNA?Step 2. Presentation1.Free talk:(1)Where is it in our body? (Show some pictures of DNA.)(2)What's the function of DNA? (Show some pictures of twins.)2. Explain the new words.3. Read the lesson and answer the questions：(1) What is a blueprint?(2) Which is more 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?4. Check the answers and underline the key words.5. Listen and follow to the tape.6. Explain the language points:between与amongbetween用于两者之间，among一般指三者或三者以上。

Unit 5 Lesson 29 DNA-The Story of YouⅠ. 根据句意及首字母提示完成单词。

1. I have a g idea of how to decorate(装饰) the house, but the details (细节) haven’t been decided.2. I haven’t got the original (原始的) letter, but I have got ac .3. I didn’t hear your sentence. Could you please r it, Miss Gao?4. The g gave his grandfather his arm and carefully supported him.5. Dr. Wang asked me to take the medicine according to the i . Ⅱ. 用括号内所给单词的适当形式填空。

6. It took the scientist half an hour (identify) what it was.7. It seems that these two events are (relate) to each other.8. All (live) things depend on the sun for their growth.9. This kind of skirt is much (expensive) than that one.10. It was (amaze) that the policemen caught the criminal (罪犯) just an hour later.Ⅲ. 根据句意及汉语提示完成句子。

11. Tom’s homework is quite good (除了) a few spelling mistakes.12. I (能) look after myself when I was five years old.13. The company produces (数以百万计的) cars a year.14. “(总的来说), German cars are very good,” Danny said.15. His heart attack could (与……相关的) his car accident last year.Ⅳ. 按要求完成句子。

九年级Lesson 29 DNA-The Story of You教案教师：Teaching Content:Mastery words and expressions: generally, twin, clone, not only…but also Oral words and expressions: blueprint, identical, egg, identifyTeaching Aims:1. Know how to write a passage on science.2. Learn something about DNA.3. Know more about our body.Teaching Important Point:1. Master the words and expressions of this lesson.2. The ability and inability.3. The use of coordinating conjunctions.Teaching Difficult Point: The usage of DNA.Teaching Preparation: picturesTeaching Aids: flashcards, audiotape, picturesType of lesson: new lessonTeaching Procedure:Step1.LeadingLead in the text by discussing what DNA is. Divide the class into several groups. Then talk about the subject for several minutes. Then one of the groups presents their opinions in front of the class.Step2. Listening task:Listen to the tape and fill in the blanks with the correct words you hear.1. Generally speaking, a ______ is a drawing.2. ______ for identical twins, each living thing has its own unique DNA. Play the tape once. Then let the students try to finish the task in class in oral.Step3. Reading task:Read the text quickly and answer the following questions:1. Where does your DNA come from?2. Is your DNA in every part of your body?Finish the reading task in class in oral. Try to get more information about the text at the same time.Step4. Read the text again.Find the sentences with the new words. Try to create situation about the new words. Then make sentences with the new words. If someone can make a whole story with the new words that we learn in this lesson, the teacher must encourage her. The sentences with the new words:1. Generally speaking, a blueprint is a drawing.2. Identical twins are two children that grew from the same egg.3. They are clones.4. From your DNA, scientists can identify not only you, but also people related to you.Step5.Let some students tell some details about the text.1. What is DNA?2. Where is your DNA from?3. What is DNA used for?Step6. Come to “LET'S DO IT”.Finish the task with a partner. Find the things about you that show your parents' DNA. Talk about if for a while. Then let some volunteers come to the front to talk about the subject.Step7.Homework1. Finish off the exercises in the activity book.2. Go on the next reading in the student book.Summary:You look like your father or your mother. That identifies the DNA of your body from your parents. DNA is very fascinating. Each living thing has its own unique DNA. Try to find more ways to use the DNA in many fields. Discuss the use of DNA in this class. Make full use of it to help more people in the world in more fields.。