Unit three Computers优秀教案
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Unit three Computers
(1)课题：
1. Information technology
2. History and basic knowledge of computers
3. Robots.
(2)教材分析与学生分析
本单元的中心话题是“计算机”，单元各项说读写活动的设计都围绕这一
主题进行。内容涉及计算机的发展历史、计算机的应用等，其中还谈到包括计
算机在内的集中信息技术的载体、智能机器人的发明等等。
(3)教学目标
1、 Talk about computers and its development.? ?2、Learn passive voice ?3、To practice making decisions and reasoning 4、?Learn to describe an android.
(4)教学重难点
1 重点词汇短语
calculate common. universal . intelligence . anyway. totally. advantage. disagree .
choice . material .create. arise. personally
technology
go by .so…that…:. in a way. after all. with the help of. watch over . deal with
2. 语法(重、难点)? passive voice(present perfect tense).
Period One Reading
Step 1 Warming up
Look at the pictures on page 17. What are they? What do they have in common? Yes, they are computers. Then what is a computer?
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 computer frequently requires a boot device. The boot device contains the computer’s operating system and data. Computer programs can be installed onto a computer. Some people think that computers are less useful if they do not have access to the Internet. They think this because the Internet allows the computers to send and receive data and email across the world.
A computer 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 stewardship.
In some countries old computers are recycled (melted down) to get gold and other metals. This is dangerous, because this procedure releases the toxic waste into the water and soil.
?Computers become obsolete quickly. Very often they are given away and new ones replace them within two or three years. This makes the problem worse. Computer recycling is thus common. Many projects try to send working computers to developing nations so they can be re-used and will not become waste as quickly.
Step 2 . Pre-reading
1. Questioning and answering What do you know about computer?.
●A multi-function electronic device that can execute instructions to perform a task.
●A device that accepts information, processes it, and supplies an output. A computer usually contains memory, a control unit, arithmetic and logical units, and a means for input and output.?
●a machine for performing calculations automatically calculator: an expert at calculation (or at operating calculating machines)?
2. Discussing and sharing How have computers changed our lives?
Someday soon, if you haven’t already, you’re likely to plug into the computer network nation growing in our midst. Computer terminals, or small computers connected via modem (a modulator/demodulator circuit for encoding/decoding computer chatter) to ordinary telephone lines, should be as ubiquitous as the telephone itself. They’re a much more useful and humane tool than the phone, and with corporate?America?behind them the networks will be everywhere----changing our lives more than any technology since the automobile.
Joining a computer network is the same as joining a community. Small systems are like villages, where new members are formally welcomed. The larger networks, the Source and CompuServe, for example, are cities-anonymous, full of life and events, but difficult to fit into.
Step 3. Reading??
1. Listening and reading to the recording of the text WHO AM I?
Turn to page 18 and listen and read to the recording of the text. Pay attention to the pauses, pronunciation and intonation of the native reader.
2. Reading aloud and underlining expressions
Now we are to read the text once again and underline all the expressions in the text. Put them down into your notebook after class as homework.
?
Collocations from WHO AM I?
begin as…, a calculating machine, be built as…, follow instructions from…, sound simple, at the time, a technological revolution, write a book, make…work, solve problems, become huge, had artificial intelligence, go back to…, the size of…, go by, change size, become small and thin, get quick, stand there by oneself, be connected by…, share information by…, talk to…, bring…into…, deal with…, communicate with…, serve the human race
3.?Reading, identifying and settling
Attention, please! It is time to skim the text one more time and identify the difficult sentences. Try analyzing the structures of the difficult sentences and discuss them among your group members. You may also put your questions to me for help.
Chat （online）（在线）聊天
To chat is to talk about ordinary things that are not very important. You can chat to one person or to many people. People also use this word now for parts of the Internet where we can talk with many different people at the same time. Usually, you chat on the internet in a chat room or messaging service like AOL(American On-Line) Instant Messenger (AIM), Yahoo Messenger, or MSN Messenger.
4.?Reading?and transferring
Scan the text for information to complete the table below, describing the development of computer.
In 1642
?
In 1822
?
In 1936
?
In 1960s
?
In 1970s
?
Step 4. Closing down by doing comprehending exercises
Turn to page 18 and in pairs do the comprehending exercises No. 1 and 2.
age
(The Present Perfect Passive Voice)
Period Two Learning about language
Step 1 Discovering useful words and expressions
Do the exercises 1, 2 and 3 on pages 20. You must finish them in 10 minutes.
Step 2. Learning about grammar
1. Passive Voice—Overview
Tense or Model
Passive Sentence
Simple Present
The TOEFL exam is given every six months.
Simple past
The TOEFL exam was given last month.
Simple Future
The TOEFL exam this year will be given on October15.
Present Continuous
The TOEFL exam is being given every year.
Present perfect
The TOEFL exam has been given every year since 1950.
Past perfect
The TOEFL exam had been given before the Vietnam War occurred.
Simple Modal
The TOEFL exam should be given to every Foreign student.
Past Modal
The TOEFL exam should have been given to all to enter US colleges.
2. The Present Perfect Passive Voice
The structure of The Present Perfect Passive Voice is: have/ has ＋ been＋~ed
Step 3. Reading aloud and discovering
Now go back to page 18 to read aloud and discover in the text examples of The Present Perfect Passive Voice.
As the years have gone by, I have been made smaller and smaller.
Since then, my family and I have been used by billions of people to deal with information with each other around the world by the Internet.
Step 4. Discovering useful structure
We shall do grammar exercises 1, 2 and 3 on page 21.
?Step 5. Closing down by doing a quiz
Correct the mistakes in these passive voice sentences
Example: The house was build in 1880. (correct = The house was built in 1880.)
1.? 3000 employees were laying off.?
2.? A story will made up.
3.? An idea was putted forward for discussion.
4.? Has the book been give back to you yet?
5.? My bank loan will be payed off in five years time.?
6.? Nothing can be hold against me.
7.? Our allies will be lend support.?
8.? She has never heard of.?
9.? She was being knocked down by a bus.?
10.? She was letted off with a fine.?
11.? The candle was blow out by the draught.?
12.? The criminal were locked up.?
13.? The flood water was be kept back by barriers.
14.? The inconvenience will made up for by this money.?
15.? The keys must have been being left behind.?
16.? The old cinema is being pull down.?
17.? The protesters being held back by the police.?
18.? The road was blocking off.?
19.? Thirty more people were laid off last week.?
20.? Your jacket can be hanged u 内容过长，仅展示头部和尾部部分文字预览，全文请查看图片预览。 re or cable to your computer. Eventually, you see the web site you were looking for.
If you decide you want to print the page, you click on the printer icon. Again, you have provided input to tell the computer what to do. The browser software determines whether you have a printer attached to your computer, and whether it is turned on. It may remind you to turn on the printer, then send the information about the web page from your computer over the cable to the printer, where it is printed out.
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