高中英语人教版必修2 (2007年4月第2版) Unit 3 Computers
Reading—Who am I?
【教学设计】
1. 教材分析
(1) 本单元紧紧围绕中心话题“计算机”展开，内容涉及计算机的发展历史、计算机的应用等等，期中还谈到包括计算机在内的集中信息技术的载体、智能机器人的发明等等。
(2) 阅读部分(reading)部分题为 Who am I? 的文章以第一人称的拟人手法介绍计算机发展演变的历史和计算机这各个领域的应用，其主旨是表达计算机的发展变化之快以及在生活中用途之广。计算机的演变经历了几个历程：1642年最初以一种“计算机器”的身份诞生，大约200年后，Charles Babbage把它变成了一种“分析机”。之后计算机有了“人工智能”，但直到1936年，计算机才真正被“广泛地”用来解答复杂的数学问题。虽然计算机的能力越来越大，但是体积却越来越小，从1940年前一个房间那么大到后来的个人电脑，再到便携式电脑。计算机的记忆能力也在不断发展，从最初存储到电子管，到后来小小的芯片。如今计算机也不再孤军奋战，而成为互联网庞大的家族中的一员。伴随着这些变化，计算机的使用几乎遍及了生活的方方面面，比如交流、财经、贸易、手机、医疗和航天等，真正成为我们生活中不可缺少的一部分。通过对本篇文章的阅读，学生不仅在轻松的氛围中了解了计算机的相关信息知识，学到了与此相关的一些语言知识，还能清晰地了解作者的写作思路，从而实现了阅读理解的三个维度：信息知识、语言知识和语篇知识。
2. 教学目标：
（1）知识目标：通过阅读，了解计算机的发展历史及其在当今世界的应用。
（2）能力目标：通过阅读技巧训练，找出段落主题句，把握文章主旨大意，获取关键信息，并能表达个人观点。
（3）情感目标：通过本文的学习，激起学生对电脑的兴趣，并学会科学使用电脑。
3. 教学过程
I. Leading-in
i. 跟学生们玩guessing game, 展示abacus, calculator, laptop等相关图片，激发学生对computers这一话题的兴趣。
ii. abacus—calculator—laptop，展示了越来越大的变化过程；PC—laptop—PDA展示了越来越小的变化过程，进而引起学生对电脑发展过程的兴趣。提出问题：Do you want to know more about the development of computers? 自然过渡到reading部分。
II. Reading (课文阅读)
Step one (第一步) Skimming (快速阅读)
1. Who is the speaker of the text?
2. What is the topic sentence of each paragraph?
Paragraph 1:____________________________________________________________
Paragraph 2:____________________________________________________________
Paragraph 3:____________________________________________________________
【点拨技巧】topic sentence 的位置？
______________________________________________________________________
3. What’s the main idea of the text?
____________________________________________________________________
4. Can you put these inventions in an order according to the time when they appeared?
( ) calculating machine ( ) PC
( ) analytical machine ( ) laptop
( ) robot ( ) universal machine
本环节是阅读的第一步，要求学生在5分钟内快速阅读文章，完成4个任务：（1）找出作者是谁？（2）找出每段的主题句 （3）总结文章主旨大意 （4）对相关电脑的发明根据时间正确排序。让学生通过完成每个任务，培养找出段落主题句和总结篇章主旨大意的能力，及对简单细节快速提取的水平。
Step two (第二步) Careful reading (精读)
Read the whole passage again carefully and finish the following tasks.
Task 1. Finish the timetable below.
TIME
EVENTS
1642
It began as a , which is used to
difficult ______.
?
Computers were built as an analytical machine by Charles Babbage. At that time, it was considered a ______ _______ and the start of _______ _______.
1936
Computers worked as a universal machine to _____ difficult problem. From then on, computers grew rapidly both in ____ and ______.
1940s
How big is a computer?
_______________________________________
?
The first family of computers was connected to each other.
1970s
Where are computers used?_________________ And what about the applications? _______________________
Now
Computers become a _____ friend and helper of ____ _____.
Task 2: Read the passage carefully and answer the following questions.
1. Why and how did computer change its shape?
______________________________________________________________________________________________________________________________________
2. What are the applications of the computer?
_________________________________________________________________________________________________________________________________________________________________________________________________________
___________________________________________________________________
Task 3 Challenge yourself
本环节是阅读的第二步：仔细阅读。本环节中分别给学生留出3分钟以此默读课文第1,2,3段，并分别完成相应任务。尤其是任务3，以选择魔方的方式，回答相应选择的问题，尤其问题2，根据高考新题型的要求，从文中找出3个经典句子，设置了3个单句改错题型，鼓励学生思考改错，并重视平时基础的落实，提高新题型成绩。在思考问题过程中，同桌可以交流意见，合作解决有疑问的问题，然后呈现答案。通过本环节的问题，训练学生在规定的时间内，正确提取有效信息和推理判断的能力。
Step three (第三步) Discussion (合作讨论)
1. Supposing that(假如)you were Mr/Mrs computer who knows much about computers and one student wants to interview you to know something about computers. Now make a dialogue between you and the student.
You can use the following pattern:
Student: Hello! I am a student of No.1 Middle School . May I ask you some questions?
Mr/Mrs computer: Ok!
Student: When and where did computers begin?
Mr/Mrs computer: ……
Student: ……?
Mr/Mrs computer：……
Student: What happened to computers in the1960s?
Mr/Mrs computer: ……
Student: What can computers be used today?
Mr/Mrs computer: …….
Student: What can we use them to do in the future?
2. Do you think computers have more advantages or disadvantages? Why?
阅读第三步：讨论 本环节要求学生再认真阅读文章2分钟，然后小组内讨论两个问题。鼓励学生根据所学信息编对话；并客观看待电脑的优缺点，学会科学使用电脑。通过本环节的讨论，加深了学生对课文的进一步理解，并深入探讨如何正确使用电脑。
Step four (第四步) 语法填空
The history of computer began in 1642 in France. It was first built only as a 1
(calculate) machine, and later as an Analytical Machine that could “think”
2 (logic) and produce an answer quicker than any person. Still later, the “ 3 machine” is built 4 (solve) mathematical problems, 5 made computer huge! 6 the years have gone by, computer has been made smaller, quicker and cleverer. Later, computers have a family 7 (connect) by a network. It was able to __8 knowledge __9 others. Nowadays, it is a 10
(devote) friend and helper of the human race.
1. __________ 2.___________ 3.__________ 4. __________ 5. ____________
6. __________ 7. _________ 8. ___________9. ___________ 10. ___________
本环节，要求学生在熟悉课文内容的基础上，对要点进行重新梳理和巩固，以高考新题型—语法填空形式出现，培养了学生们用真确形式完成由reading课文改写的短文。
Step five (第五步) Conclusion (总结)
本环节，老师简要总结课堂要点；1) 如何找段落主题句，提炼文章主旨大意； 2) 通过讨论，学会如何正确使用电脑；3) 上课积极大胆发言，勇于用所学知识表达自己。然后，点评学生表现，表扬优秀小组，激励表现不理想的小组。
Step six (第六步) Homework (作业)
最近一部分同学迷恋计算机，就此我们班召开了主题班会对此问题进行了讨论，请将讨论结果用英语写一篇120字左右的文章, 并发表自己的看法。
Useful patterns:
Some people hold the view that……
Others think / have the opposite view that……
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
本环节要求学生根据文章所学内容及自己通过讨论对电脑利与弊的理解，完成一篇话题作文，加深对课文理解的同时，提高书面表达能力。
4. 板书
(1) Unit 3 Computers Who am I ?
(2) 小组评价展示：
小 组
表 现
1
2
3
4
5
6
7
8
9
注：个人积极答对一个问题，即给所在的组得1分；讨论环节积极表现并表述得当者得5分；最后，作出总结性评价，评出表现最优秀的小组，并对表现差的小组提出鼓励和要求。
5. 教学反思
（1）在导入环节，利用图片为阅读创设情境，引起学生对该文章阅读的兴趣。通过快速阅读、精读，让学生在把握文章主旨大意的基础上又掌握了细节信息。通过讨论对话，更熟悉电脑的发展史。通过讨论了解了电脑的利与弊，学会了如何科学使用电脑，并提高了学生的语言组织能力。
（2）教学方法：阅读过程中的“动静结合”的阅读活动和小组合作探究活动达到了理想的效果，从文章内容的理解到思想的升华。
Step V. 语法填空
The history of computer began in 1642 in France. It was first built only as a 1
(calculate) machine, and later as an Analytical Machine that could “think”
2 (logic) and produce an answer quicker than any person. Still later, the “ 3 machine” is built 4 (solve) mathematical problems, 5 made computer huge! 6 the years have gone by, computer has been made smaller, quicker and cleverer. Later, computers have a family 7 (connect) by a network. It was able to __8 knowledge __9 others. Nowadays, it is a 10
(devote) friend and helper of the human race.
1. __________ 2.___________ 3.__________ 4. __________ 5. ____________
6. __________ 7. _________ 8. ___________9. ___________ 10. ___________
Step VI. Homework
最近一部分同学迷恋计算机，就此我们班召开了主题班会对此问题进行了讨论，请将讨论结果用英语写一篇120字左右的文章, 并发表自己的看法。
Useful patterns:
Some people hold the view that……
Others think / have the opposite view that……
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
课件36张PPT。Unit 3 Computers
Who am I ?Welcome!The technology develops so quickly that many new things appear in human beings’ life.Let’s guess what they are:guessing game I am very old now. I was born in China. Many people used me for calculating in the past, but now I am a bit lonely because they don’t like me now.
Do you know who I am?abacusGuess : I am very small. I can be used for calculating. In China, a lot of students use me when solving mathematical problems.
Do you know who I am?calculator I can be used for calculating. Besides, I can also be used for watching DVD, sending e-mail and communicating through the Internet. However, I am not a PC, because I’m small enough for you to take me with you.
laptop (computer) Do you know who I am?abacuscalculatorhuge computerbigger PClaptopPDAsmallerReading Who am I ?Learning objectives
1. 知识目标：Enrich your knowledge
about computers and computer
technology.
2. 能力目标：Enhance your reading ability
and speaking ability
3. 情感目标：To arouse students’ interest
on computer and use computers correctly Skimming1. Who is the speak of the text?
2. What’s the topic sentence of each paragraph?
3. What’s the main idea of the text?
4. Put the inventions in time order.
1. Who is the speaker of the text?
____________A computer.2. What is the topic sentence of each paragraph? Paragraph 1:
Paragraph 2:
Paragraph 3: Over time I have been changed quite a lot.These changes only become possible
as my memory improved.Since the 1970s many new applications have been found for me.点拨技巧：
topic sentence一般在段首或段末。3.What’s the main idea of the passage?
This passage is mainly about
the history and the development
of the computer.3.Can you put these inventions in an order
according to the time when they appeared?
( )calculating machine
( )PC
( )analytical machine
( )laptop
( )robot
( )universal machine
123456ScanningTask 1
Finish the timelineReading for detailscalculating machinesimplifysumstechnological revolutionartificial intelligencesolvesize1822devotedhuman raceComputers grew as large as a room. Computers were used in offices and homes. Many new applications have been found for them.1960sTask 2: Answer the following
questions.
1. Why and how did computer change its shape?
Computers changed because the memory of it got improved.
First it was stored in tubes, then on transistors and later on very small chips.
2.What are the applications of computers?
①They have been used in communication, finance and trade.
②They have been put into robots and used to make mobile phones as well as help with medical operations.
③ They have been put into space rockets and sent to explore the Moon and Mars.231Task 3 Challenge yourself1.In what order was the passage organized?Time2. Correct mistakes in the following sentences.
1) Over time I was changed a lot.
2) As time going by, I was made smaller.
3) Anyhow, my goal is provide humans with a life high quality.
was changed 改为 have been changedgoing改为went, 或 As 改为Withprovide 前加上to; high 前面加 of3.Translate the following sentence into Chinese.
Over time my memory has developed so much that , like an elephant, I never forget anything I have been told.
随着时间的推移，我的记忆能力发展得如此之快，就像一头大象一样，我从来不会忘记告诉我的任何事情！
Group discussionTask 1:
Supposing that(假如)you were Mr/Mrs computer who knows much about computers and one student wants to interview you to know something about computers. Now make a dialogue between you and the student.
You can use the following pattern
Student: Hello! I am a student of No.1 Middle School . May I ask you some questions?
Mr/Mrs computer: Ok!
Student: When and where did computers begin?
Mr/Mrs computer: ……
Student: ……?
Mr/Mrs computer：……
Student: What happened to computers in the1960s?
Mr/Mrs computer: ……
Student: What can computers be used today?
Mr/Mrs computer: …….
Student: What can we use them to do in the future?
When and where did you begin?What can you be used today? What happened to you in the 1960s?Task 2 Advantages VS. DisadvantagesAdvantages:search for informationchat with friends shopping onlineread news send emailsdownload music and filmsOther uses:
look at photos on the computer
read books and magazines
Watch movies
Play computer games
Listen to music
Surf the web for fun
Enrich our knowledge about the world
Make new friends
Using online source to learn English
The suicide of the boy because of
being addicted to computer gamesdisadvantagesOther disadvantages:
Too expensive
Being addicted to computers can affect your study
Some unhealthy information can pollute you
Being addicted to computers can affect your physical and mental health
Being cheated by others on the computer
Commit a crime through computer
语法填空：
The history of computer began in 1642 in France. It was first built only as a _________(calculate) machine, and later as an Analytical Machine that could “think”
_______ (logic) and produce an answer quicker than any person. Still later, the “__________ machine” is built ________(solve) mathematical problems, _________ made computer huge! _______time went by, computer has been made smaller, quicker and cleverer. Later, computerscalculatinglogicallyuniversal to solvewhichAs【课后延伸】
最近一部分同学迷恋计算机，就此我们班召开了主题班会对此问题进行了讨论，请将讨论结果用英语写一篇120字左右的文章, 并发表自己的看法。
Useful patterns:
Some people hold the view that……
Others think / have the opposite view that……
in my view/in my opinion/as far as I’m concerned/from my point of viewThank you !
