(最新)必修二unit3-computers-(reading)精品课件.ppt

1、Unit 3,reading,computers,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 dont like me now. Do you know who I am?,abacus,Riddles (谜语),I can be used for calculating. Besides, I can also be used for watching DVD, sending e-

2、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?,laptop,PDA Personal Digital Assistant,I am so small in size that I can fit in your hand. I usually have a small screen usually bigger than a digital phone,

3、but 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 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?,calcu

4、lator,I am very big. Scientists use me to solve some mathematical problems.,huge computer,Do you know who I am?,robot,Im a machine that works automatically. I can do different kinds of tasks, especially suitable for doing jobs too boring, difficult, or dangerous for human beings. Do you know who I a

5、m?,PC Personal Computer,Im a small, relatively inexpensive computer designed for an individual(个人的) user. Im based on the microprocessor(微处理器) technology. At home, people use me to surf the Internet and play games. Do you know who I am?,PDA,abacus,calculator,huge computer,PC,laptop,Whats next?,Can y

6、ou tell the development of computers?,robot,artificial intelligence,What do they have in common?,1.They can be used for calculating. 2.They can deal with maths problems. 3.They are our friends. 4.They are useful and helpful.,Discussion,2.Look at these pictures and guess what they are.,a calculating

7、machine,analytical machine,universal machine,solve difficult mathematical problems,computer as large as a room,3.Look at these inventions. Can you put them in an order according to the time when they appeared? After reading the passage, check to see if you are right. ( )analytical machine ( ) laptop

8、 ( ) calculating machine ( ) robot ( ) PC ( ) universal machine,Reading,WHO AM I?,1. Who is the speaker in this story?,2. Find out the topic sentence of each paragraph and the main idea of this passage. A. The development of computers. B. The development and use of computers. C. A machine which is s

9、imple-minded. D. Computers may replace human beings. 3. The text is written in the order of . A. time B. space C. logic D. all the above,A computer.,Fast reading,Look at these inventions. Can you put them in an order according to the time when they appeared? After reading the passage, check to see i

10、f you are right. ( )analytical machine ( ) laptop ( ) calculating machine ( ) robot ( ) PC ( ) universal machine,1,2,3,4,5,6,While-reading(3):careful reading,Read the passage again carefully and finish Ex. 2 on P19 in the student book.,Over time I have been changed quite a lot.,calculating machine,a

11、nalytical machine,universal machine,PC,laptop,Why could the analytical machine “think” logically and produce an answer quicker than any person? Because it was programmed by an operator who used cards with holes.,Those changes only became possible as my memory improved,tubes,transistors,chips,network

12、,World Wide Web,2.I totally changed my shape, because,my memory was first stored in tubes, then on transistors and later on very,small chips.,I totally changed my shape！,(translation) 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，

13、我的记忆力发展的如此之快，就像一头 大象，我从来不会忘记 告诉我的任何事情。,Since the 1970s many new applications have been found for me.,communications,finance,trade,robots,mobile phones,medical operations,space rockets,provide a life of high quality,3. Many new applications have been found for me, such as,in communi-,cation/ finance/

14、 trade/ robots/ mobile,Rockets.,Careful-reading:,phones/ medical operations/ space,calculating,analytical,universal,mathematical problems,Medical operations,Memory,Transistors,Applications,Communication,Trade,timeline,1642: 1822: 1936: 1940s: 1960s: 1970s:,The computer began as a calculating machine

15、.,The Analytical Machine was built by Charles Babbage.,The computer grew rapidly both in size and in brainpower.,Computer had grown as large as a room.,Computers were used in offices and homes.,The first family of computers was connected by a network.,Many new applications have been found for comput

16、ers.,Now:,Computers connect people all over the world together.,While -reading(2):,(Universal machine),True or False,Alan Turing built an Analytical Machine to solve any mathematical problems. People began to realize that the computer got cleverer and quicker with time passing. The computer began to

17、 serve the human race since it was brought into peoples homes. Since the 1970s, the computer was used by people around the world through the Internet. 5. The larger the computer is, the more memory it has.,F,T,F,T,F,How computers have changed our lives? Brainstorm a list of things that you, your school and your family use computer for.,Discussion:,Post-reading: pair-work,Advantages listen to the music watch news/movies communicate with friends buy things on line search for information store information word processing,Disadvantages play computer games too much chat（聊天） on the Internet t