1、Unit3Computer教案人教版必修2Unit 3 Computer教案（人教版必修2）Teaching AimsTo talk about computerTo read about computer ProceduresI. Warming up Warming up by talking about computerLook 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
2、 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.计算机室A computer frequentl
3、y requires a boot device. The boot device contains the computers 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 se
4、nd and receive data and email across the world.曙光3000巨型计算机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
5、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
6、 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.Computer jargon 计算机行话Computer jargo
7、n means words to do with computers and surrounding topics. Knowing what these words mean can help you know more about computers. Some people use these words to impress other people (Also known as buzzwords).Examples of jargon:Bit - The smallest data unit, can either be a “0.” or a “1.”. Byte - unit
8、of data. See also Kilobyte, Megabyte, Gigabyte and Nibble CPU Central Processing Unit, Another name for processor Data - Information stored on a computer Disk - A place to store data. Email - Electronic mail. GHz - Gigahertz. Used often incorrectly to describe the speed of a processor. But with some
9、 2.4 GHz processors faster than 3.6 GHz ones, it is clear that it is just a salesman trick. Load - Get data from a disk Nibble - Half a Byte Save - Put data on a disk RAM random-access memory(随机存取存储器), the more the better. USB - Universal Serial Bus（通用串行总线，一种简化了插接多种附件的薄型插座） WWW - World Wide Web, par
10、t of the InternetII. Pre-reading1. Questioning and answeringWhat do you know about computer?Electronic machine capable of performing calculations and other manipulations of various types of data, under the control of a stored set of instructions. The machine itself is the hardware; the instructions
11、are the program or software. Depending upon size, computers are called mainframes, minicomputers, and microcomputers. Microcomputers include desk-top and portable personal computers.A multi-function electronic device that can execute instructions to perform a task.A device that accepts information,
12、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 programmable hardware component that is controlled by internally stored programs and that can perform substantial computations (including arithme
13、tic and logic operations) without human intervention. A computer typically consists of one or more processing units, memory units, and associated peripheral input and output devices.Related to automation and electronic data processing. The Library of Congress commonly classes most computer-related b
14、ooks in HF5548, QA75-76, Z52, T385, and some TK ranges.a machine for performing calculations automatically calculator: an expert at calculation (or at operating calculating machines) A computer is a device or machine for making calculations or controlling operations that are expressible in numerical
15、 or logical terms. Computers are constructed from components that perform simple well-defined functions. The complex interactions of these components endow computers with the ability to process information. If correctly configured (usually by, programming) a computer can be made to represent some as
16、pect of a problem or part of a system. If a computer configured in this way is give2. Discussing and sharingHow have computers changed our lives?Someday soon, if you havent already, youre likely to plug into the computer network nation growing in our midst. Computer terminals, or small computers con
17、nected via modem (a modulator/demodulator circuit for encoding/decoding computer chatter) to ordinary telephone lines, should be as ubiquitous as the telephone itself. Theyre a much more useful and humane tool than the phone, and with corporate America behind them the networks will be everywhere-cha
18、nging 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 e
19、vents, but difficult to fit into.III. 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 expressionsNo
20、w 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, at that time, a technological revolution, the start of artificial intelligence, write
21、 a book, be made to work, solve problems, from then on , grow any larger, As time went by, go back to,be made smaller, memory became so large, stand there by oneself, be connected by, share knowledge with others through, be put into, provide humans with, deal with, truly filled with3. Reading, ident
22、ifying and settlingAttention, 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 ta
23、lk 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(Am
24、erican On-Line) Instant Messenger (AIM), Yahoo Messenger, or MSN Messenger.IV. Comprehending1. Scan the text for information to complete the table below, describing the development of computer.In 1642The computer began as a calculating machine.In 1822The analytical machine was made by Charles Babbag
25、e.In 1936The computer grew rapidly both in size and in brainpower.1940sThe computer had grown as large as a room.In 1960sThe first family of computer was connected to each other.In 1970sComputers were used in offices and homes.NowComputers connect people all over the world Together.2. Read the text
26、again and complete the chart below.Paragraph 1Paragraph 2Paragraph 3Topic sentenceOver time I have been changed quitea lot.These changes onlybecame possibleas my memoryimproved.Since the 1970s many new applications have been found for me.Supporting details Calculating machine Analytical machine Univ
27、ersal machine PC laptop tubes transistors chips network world wide web communications finance trade robots mobile phones space rockets providing a life of high qualityPeriod 2: Learning about LanguageTeaching Aims:To learn to use The Present Perfect Passive Voice To discover useful words and express
28、ionTo discover useful structuresProcedures I. Warming up by reading to the tapeTo begin with, turn to page 18, listening to and reading to the recording of the text WHO AM I? Attention goes to the pauses and intonation, as well as the pronunciation of the reader.II. Discovering useful words and expr
29、essionsIn pairs do the exercises 1, 2 and 3 on pages 20. You must finish them in 10 minutes.III. Learning about grammar1. Passive VoiceOverviewTense or ModelPassive SentenceSimple PresentThe TOEFL exam is given every six months.Simple pastThe TOEFL exam was given last month.Simple FutureThe TOEFL ex
30、am this year will be given on October15.Present ContinuousThe TOEFL exam is being given every year.Present perfectThe TOEFL exam has been given every year since 1950.Past perfectThe TOEFL exam had been given before the Vietnam War occurred.Simple ModalThe TOEFL exam should be given to every Foreign
31、student.Past ModalThe TOEFL exam should have been given to all to enter US colleges.2. The Present Perfect Passive VoiceThe structure of The Present Perfect Passive Voice is: have/ has beenedIV. Reading aloud and discoveringNow go back to page 18 to read aloud and discover in the text examples of Th
32、e Present Perfect Passive Voice. as a laptop, I have been used in offices and homes since the 1970s.Since the 1970s many new applications have been found for me.V. Discovering useful structureWe shall do grammar exercises 1, 2 and 3 on page 21. VI. Closing down by doing a quizCorrect the mistakes in these p
