1、人教新课标高中英语必修二Unit 3 Computers教案1 Unit 3 Computers I 教学内容分析本单元的中心话题是“计算机”。Warming up部分用图片呈现了计算机发展的历史，让学生通过看图讨论的方式了解计算机的发展和演变过程。Reading部分编者采用了拟人化的手法向读者介绍了计算机的发展历程。Comprehending部分包括三个练习，分别从事实层面、分析层面和拓展层面考察学生对文章的理解和运用情况。Learning about language部分的活动突出了形容词和副词用法的区别，并扣本单元的语法点（现在完成时的被动语态）。Using language部分的听力材
2、料中谈论的是信息技术的几种形态或载体（包括收音机、书籍、电视和电脑；在读说活动中，通过智能机器人参加足球赛的经历向读者介绍了计算机运用的另外一个例子。Learning Tip部分鼓励学生利用图书馆，网络等课外资源学习英语，有利于学生使用资源策略。Reading for Fun 部分是一首活泼风趣的小诗，以拟人的方法让机器人自述了心声：尽管日夜忙碌，为人服务，但它相信自己和真实的人类没什么两样。II教学重点和难点1教学重点(1) 本单元的生词和短语；(2) 通过学习本单元，使学生了解计算机的发展历程，及其在当今社会的广泛运用；(3) 鼓励学生用英语表达自己的观点，进行简单的推理和做出决定。2教学
3、难点(1) 教会学生通过时间的先后顺序来表达一件事；(2) 使学生了和掌握现在完成时的被动语态的用法；(3) 指导学生按类别归纳整理词汇，让学生学会有效地记忆词汇的方法；(4) 引导学生发现本单元重点语言结构，让学生自己发现并感悟相关的语言规律，在学习过程中培养语感。III教学计划本单元分六课时：第一课时：Warming Up, Pre-reading, Reading第二课时：Language points第三课时：Learning about language第四课时：Listening第五课时：Speaking, Reading, WritingIV教学步骤：Period 1 Warmi
4、ng Up, Pre-reading, ReadingTeaching Goals: 1. To know something about computers.2. To learn and talk about computers. Teaching Procedures:Step 1. Leading-inPurpose: To activate the Ss and arouse them to talk about the importance of computers in modern society.Ask Ss whether they have a computer or n
5、ot and what they use it for. Let them talk as much as possible.Step 2. Warming Up Purpose: To get Ss to think about the different ways computers can be made.Pair workGet Ss to look at the following pictures, and then ask them to answer the questions. A huge computer A PCA notebook computer A calcula
6、tor An abacus1. What are they?2. What do they have in common?3. What is a computer?Suggested Answers:1. a huge computer, a personal computer, a notebook computer, a calculator, an abacus2. (1) to be used to calculate;(2) operate by human beings;(3) they are all artificial;(4) show figures in a certa
7、in way.3. A computer is a machine which stores knowledge in its memory and does calculations on that knowledge. This knowledge is stored in symbols; it is called data. A computer usually has a monitor to show results. However, some computers can speak; these computers can be used for voice mail.A co
8、mputer is now almost always an electronic device. It usually contains materials which are toxic; these materials will become toxic waste when disposed of. When a new computer is purchased in some places, laws require that the cost of its waste management must also be paid for. This is called product
9、 stewardship.Step 3. Pre-readingPurpose: To activate Ss interest about computers.Group workAsk Ss the following questions and encourage them to say more.1. How have computers changed our lives ?2. What do you know about computers ?Suggested Answers:1. Theyre a much more useful and humane tool than t
10、he phone , and with corporate America behind them the networks will be everywhere- changing our lives more than any technology since the automobile.2. A multi-function electronic device that can execute instructions to perform a task.A device that accepts information, processes it, and supplies an o
11、utput. A computer usually contains memory, a control unit, arithmetic and logical units, and a means for input and output.A programmable hardware component that is controlled by internally stored programs and that can perform substantial computations (including arithmetic and logic operations) witho
12、ut human intervention. A computer typically consists of one or more processing units, memory units, and associated peripheral input and output devices.Step 4. Reading1. SkimmingPurpose: 1. To get a brief understanding of the text. 2. To train the students listening ability. First, let Ss skim the te
13、xt and then listen to the recording of the text. Pay attention to the pauses and pronunciation.2. ScanningPurpose: To get Ss to have some details in the text. Now we are to read the text again and underline all the expressions in the text. Write them down in your notebook.3. Further ReadingPurpose:
14、To get Ss to get more details about the text. Read the text again and find the information to complete the table, which describes the development of computer.1642: _ 1822: The Analytical Machine was made by Charles Babbage._: _1940s: _: The first family of computers was connected to each other.1970s
15、: _Now: _Step 5. RetellPurpose: To have a deep understanding of the text.Ask Ss to use the chart above to retell the development of the computer.One possible version:I, a computer, was a calculating machine in 1642 in France. Then I was built as an Analytical Machine in 1822, which was a technologic
16、al revolution. I became a “universal machine” in 1936 to solve any mathematical problem. I was not very big at first then I became huge, the size of a large room before I was made smaller and smaller. Getting new transistors, later very small chips I changed my shape. I was connected with other comp
17、uters and turned out to part of a network in the early 1960s. In 1970s I was brought into peoples homes, and came the Internet.Step 6. Homework1. Write a short passage about the development of computers.2. Finish Ex1 (P19), Ex2 (P20).Period 2 Language points Step 1 Word studyGroup workDivide Ss into
18、 four groups and ask them to discuss the following words.1. common （1） most widely known; ordinary:Eg He is a common sailor.（2） have nothing/little/something/ a lot in commonEg At first, I think we only had one thing in common, but suddenly I felt we had a lot in common.Eg The two brothers had every
19、thing in common in their manners, but the two sisters have little in common.Eg They have nothing in common with one another.2. analytical分析的Eg The scientist analyzed the milk and found it contained too much water. 3.technology 科技；技术Eg With the development of technology, we will cure AIDS sooner or l
20、ater.4.calculate(v.)1) to use numbers to find out a total amount, distance, etc. 计算； 核算We havent really calculated the cost of the vacation yet.2) to guess sth by using all the information available 推测，估计It is impossible to calculate what influence he had on her life.5.As time went by, I was made sm
21、aller.随着时间的推移，我被弄得越来越小。go by : to pass 逝去，过去Things will get easier as time goes by. 随着时间的推移，情况会有所改善。6.totally:completely 完全地； 全部地； 整个地 They come from totally different cultures.他们来自完全不同的文化。7.share with: to have or use sth at the same time as sb else 共用，合用 Mary shares a house with three other student
22、s. 玛丽和另外三个学生合住一间房子。 Share in 分享，分担8.explore (v.) 1)to travel to or around an area or a country in order to learn about it 勘察； 探索； 考察 The city is best explored on foot. 最好是徒步考察这个城市。 2）examine sth completely or carefully in order to find out more about it. 探究，调查研究 These ideas will be explored in more
23、detail in Chapter 7.这些想法将在第七章里作更详细地探讨。9.in a way: to a certain extent 在某种程度上 In a way you are right, but this new textbook is too boring. 从某种程度上说你是对的，但是这本新教材是很枯躁的。 In the way 阻碍，妨碍Step 2. HomeworkUse the words above to make sentences and check them with your partner.Period 3 Learning about LanguageS
24、tep 1. Learning about Language1. Fill the blanks and check the answers altogether.(1) Snow is _(常见的) in cold countries.(2). Can you _(估计)the cost of this journey? (3). The _(分析) of the samples on the murder spot showed some valuable cluesto the police.(4) I shall go and see him _(无论如何)(5) Hes some k
25、ind of _(数学)genius.(6). He is too s_ to work out such a difficult problem.(7). He asked his fathers o_ about his plans.(8). How are you going to d_ with the letter?(9). I _(完全) agree to your plan.(10). This is a t_ beautiful picture.2. Change the following sentences with the meaning not changed. (1)
26、 I like a lot of what she likes.We have a lot_ _.(2) Harry helped me with my English, so I learnt a lot. I made great progress in English_ Harrys _.(3) Time passed quickly. Peter grew into a tall young man. With the time _ _, Peter became a tall young man.(4) You said it was very special. I dont thi
27、nk so. I_ with what you said.(5) In my opinion, Mickey is the kind of person we need. _, Mickey is the very man we need. 3. GrammarPurpose: To get Ss to have knowledge of this grammar point: present perfect passive voice.(1) Presentation Revise the grammar: the present passive voice.am / is / are +
28、done Revise the grammar: the present perfect voice.Have/has + done Explain the grammar: the present perfect passive voice.Have/has been +done(2) PracticePurpose: To get Ss to have knowledge of the grammar through exercise. Fill the blanks with the correct tense.A. The window is dirty. It _ _ (not cl
29、ean) for weeks.B. -George and Lucy got married last week. Did they have a big wedding?-No, I _ (not invite). Did they have a big wedding?. C. -Have you moved to your new apartment? -Not yet, it _(paint) at the moment.D. too much. The students have been made _(not play) computer games E. Since then,
30、all different kinds of information _(处理)by computers.F. He doesnt mind the story _(编造) in this way.G. Do you know how many websites there are _(连接)?Suggested Answers: A. hasnt been cleaned B. hadnt been invited C. is being painted D. not to play E. has been dealt with F. being made up G. to be connected Translating following sentences into Chinese and pay attention to the present pas
