必修二unit3_computers2.ppt

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1、ComputersUnit 3I 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 dont like me now. Do you know who I am?abacusRiddles (Riddles (谜语谜语) )I am very small. I can be used for calculating. In China, a lot of students use me when

2、 solving mathematical problems. Do you know who I am?calculatorPC Personal ComputerIm a small, relatively inexpensive computer designed for an individual user. Im based on the microprocessor technology. At home, people use me to surf the Internet and play games. Do you know who I am?I can be used fo

3、r 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 Im small enough for you to take me with you. Do you know who I am?laptopPDA Personal Digital AssistantI am so small in size that I can fit in your hand.

4、 I usually have a small screen usually bigger than a digital phone, however smaller than the smallest laptop, Im a great way to store telephone numbers, access the internet, make calculations, and so on. Do you know who I am?I am very big. Scientists use me to solve some mathematical problems. huge

5、computerDo you know who I am?robotIm a machine that works automatically. I can do a wide variety of tasks, especially suitable for doing jobs too boring, difficult,or dangerous for human beings. Do you know who I am?PDAabacuscalculatorhuge computerPClaptopWhats next?Can you tell the development of c

6、omputers?robotDo you know in what ways computers are used today? Work out a list and compare it with your partner.search for see movieslisten to musicread books and magazinessend emails to friendsdownload music and filmsbuy things on lineplay games on the computerdraw pictureslook at photographs on

7、the computeruse a computer for school worktake part in chat groupsWHO AM I?Reading1. Who is the speaker in this story? 2. Whats the main idea of this passage? A. The development of computers. B. The development and use of computers. C. A machine which is simple-minded. D. Computers may replace human

8、 beings.A computer.SkimmingReading Comprehension IThese changes only became possible as my memory improved.Since the 1970s many new applications have been found for me.Over time I have been changed quite a lot.Para 1:Para 2:Para 3:Match the main ideas and the paragraphs.Reading Comprehension III1642

9、1822The analytical machine was made by Charles Babbage.The computer began as a calculating machine1936The computer grew rapidly both in size and in brainpower.Finish the timeline below.ScanningReading Comprehension II1940sThe first family of computers was connected to each other.1970s Now1960sComput

10、ers were used in offices and homes.Computers connect people all over the world together.The computer had grown as large as a room.Complete the chart below. Para-graph 1Para-graph 2Para-graph 3Topic sentenceSupporting detailstubescommunica-tions financeScanningReading ComprehensionParagraph 1Topic se

11、ntenceOver time I have been changed quite a lot.Supporting details1 calculating machine2 analytical machine3 universal machine4 PC5 laptopParagraph 2Topic sentenceThese changes only became possible as my memory improved.Supporting details1 tubes2 transistors3 chips4 network5 World Wide WebParagraph

12、3Topic sentenceSince the 1970s many new applications have been found for me.Supporting details1 communications 2 finance 3 trade4 robots 5 mobile phones6 medical operations7 space rockets8 providing a life of high qualityBrainstorm a list of things that you, your school and your familyuse computers for.Think about what you wouldhave to do if you could not usecomputers any more.DiscussionDiscussion