unit 3 computers课件

课件35张PPT。Welcome to my class !
Let’s enjoy a preview of a recent movie which arose so many students’ attention!
Before the lessonThe frightening or vivid pictures are made with the help of_____________computers------- Thor: The Dark World unit 3 computersNowadays computers play a very important role in our daily life .What do you know about computers?“who am I ?”quizabacusabacus ['?b?k?s] The abacus played a very important part in calculating in ancient China.calculate ['k?lkjulet] calculator ['k?lkj?le?t?] The calculator is widely used
in business and finance. finance['fa?n?ns]?
huge computerIt was built to solve some mathematical problems.mathematical [,m?θ?'m?t?kl] solve [s?lv] PC A PC is a personal computer which can solve all kinds of problems and is used widely now.personal computerlaptoplaptop['l?ptɑp]? /notebook computerA laptop can be taken conveniently like a notebook.PDAPersonal digital assistant. PDAs can store information ,send and receive email, and connect to the Internet.['d?d??t(?)l]robot ['r??b?t] Can you number the pictures according to the time? Test yourself:laptoprobotPDAPChuge computercalculatorabacusThe development of computersvirtual keyboards
虚拟键盘WHO AM I?Reading1.who is the speaker ?Task 1: Skimming 2. we can know that the text is written in an order of ___________time3. What’s the main idea of this passage?
A. The computer wants to find “who he is”.
B. The development and use of computers.
C. The fun_ction(功能) of the computer.
D. Computers may replace human beings.
2. When was the “universal machine” built?
A. In 1822. B. In 1642.
C. In 1936. D. In 1970. Task 2 ScanningVS1. Who was the first person to make the earliest computer?
A. Alan Turing. B. Charle Babbage.
C. Charles Turing. D. Alan Babbage.
4. How old is the computer?
A. About 170 years old.
B. About 270 years old.
C. About 371 years old
D. About 471 years old.Scanning3. When was the computer the biggest?
A. In 1642. B. In 1936.
C. In the 1940s. D. In the 1970s.VSTrue or FalseI began as a calculating machine in Japan
in 1642.
2. My real father was Charles Babbage, who
wrote a book and built me in 1936.
3. In 1936, I grew rapidly both in size and in brainpower.
4. I was brought into people’s homes in the 1970s.
5. Since my birth I have been built to take the
place of the human race. Task 2 ScanningVStimeline
1642:
1822:
1936:
1940s:
1960s:
1970s:
Now: The computer began as a calculating machine. 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 officers and homes.Computers connect people all over the world together.The first family of computers was connected to each other. Task 3 Detailed Reading
VSPara. 1Topic sentence:
Supporting details:






Over time I have been changed quite a lot.calculating machineanalytical machineuniversal machinePClaptopa huge computerTask 3 Detailed Reading
the development of the computerHow did its change?Para. 2Topic sentence:
Supporting details:
tubes




These changes only became possible as my memory improved.transistorschipsnetworkWorld Wide Webintelligent but lonelyHow did its memory
improve?Para. 3Topic sentence:
Supporting details:
communications
finance





Since the 1970s many new applications have been found for me.traderobotsmobile phonesmedical operationsspace rockets providing a life of high qualityWhat are the new applications?Let’s do
summaryTask 4:
I began as a _______ _______ in 1642
in France. In 1822 I was built as an
_____ _________. Then in 1936 Alan Turing
wrote a book and built a _______ ______.
As time___ ___, I was made ______ but my memory got ______ and _____. In the 1960s they gave me a family connected by__ ______. Now people call it the Internet. I was used in ______ and ______ in the 1970s. Since my birth I have truly been built to serve the human race.calculating machineAnalytical Machineuniversal machinewent bysmaller largerlarger a networkofficeshomesThe summary about the text What are the advantages and
disadvantages of the
computers?
In my opinion,I can
use the computer
to….
Discussionlisten to musicWatch moviessearch for informationdo shoppingHow do you use computers and the Internet?Chat (聊天) advantages
we can
communicate with friends
listen to the music
see films & watch news
play games
do shopping
save a lot of time
do a lot of useful things Disadvantages
1.Some students may get too addicted (沉溺于)to it .
2.Some students waste too much time in playing computer games.
3.Some students spend too much time in chatting with others and may be cheated (欺骗)by someone on line.

4.It is bad for our eyes and health to spend long time in front of computers.
Conclusion
There is no doubt that computer has two sides, too. If we make good use of it, it will make our lives more colorful and convenient. But don’t lose yourself in playing computers. Just remember: Keep fit, study well and work hard.Homework:Review the passage,
find out the language points in the passage.
2. Finish Exercise 1and 2 in Learning about Language on page 20.Thank you for your listeningHow do you use computers and the Internet?YesNoI often use a computer to…, I sometimes use it to…, and I never use it to…keyboard 键盘mouse 鼠标monitor 显示器screen 屏幕speaker 音响host
主机What English words do you know about computers?I am a machine, which you can use to play games, watch movies, listen to music, communicate with your friends, gather information… Who am I ?A computerGuess