课件21张PPT。Unit 3 ComputerslighttelephoneDVDaeroplanePC TVcell-phoneWhich one is the greatest invention?According to a public survey on the greatest invention in the 20th century, which was organized by some media( sina) last year and lasted almost half a year , internet and PC came first and second. Survey and report.1.How many students have PC at home ?
2.How many students have PC which are connected to Internet?
3.What do you use computers for?InternetHow useful computers are!153426monitor 4. CD-ROM
keyboard 5. screen
mouse 6. hard diskLabel each part. ThinkingHow was the computer invented ?
And how did the computer technology develop?Predict : look at these inventions. Can you put them in an order according to the time when they appeared?( ) analytical machine
( ) calculating machine
( ) PC( ) laptop
( ) robot
( ) universal machine123456SKIM(跳读) the years to finish the Timeline
1642:
: The Analytical Machine was made by Charles
Babbage.
:
1940s:
:The first family of computers was connected to
each other.
1970s:
Now: The computer began as a calculating machine.1822Alan Turing wrote a book to describe how computers could be made to work as a universal machine. The computer had grown as large as a room.1960sComputers have been used in offices and homes. Computers have become a devoted friend and helper of the human race.1936Scan( 略读) the pictures, the title , the first sentence of each paragraph to summarize the main idea of the text in one sentence.The text tells us the development of the computer technology .Careful reading: read paragraph one and complete the chartOver time I have been changed quite a lot.Calculating machine
Analytical machine
Universal machine
pc
laptop
Read paragraph two and complete the chartThese changes only become possible as my memory improved.Tubes
Transistors
Small chips
Network
World Wild WebRead paragraph three and complete the chartSince the 1970s many new applications have been found for me.Communications
Finance
Trade
Robots
Mobile phones
Medical operations
Space rocketsDiscussion1. In what order does the write develop the text?
In order of time
2. Which type/style does the text belong to ?
Description(描写)
Narration(叙述)
Exposition(说明)
Argumentation(议论)
3. Why does the writer use the title WHO AM I ?
What kind of literary devices (修辞)does the text used?
Personification
the first person—simple, vivid, interesting,understandable.
Oral presentation on the development of computer technologyuse the third person—the computer.Calculating machine
France, 1642Analytical machine
Charles BabbageUniversal machine
1936 Alan TuringArtificial intelligencePC/desktop/laptopInternetRobot? Over time ; Began ; …before… ;
After… ; At that time ; By the 1940s ;
From then on ; As time went by ;
First, and then, and later ; As a result ; since… ;
Now; In the futureDiscussionWith the development of computer technology, the internet had become more and more popular among students. However, just as a saying goes, a coin has two sides. The internet brings both advantages and disadvantages to students.
Work with your partners to list three advantages and disadvantages of the internet. With the development of computer technology, the Internet has become more and more popular.
Some students consider it as a great helper._________________
However, other students think that___________________________
Therefore, we should make proper use of the Internet. It is of great importance for us to separate good plants from wild weeds.
上网浏览: -surf the internet
方便的 : it is convenient to …
With the development of computer technology, the Internet has become more and more popular. Some students consider it as a great helper. Since there is a lot of information on line, you can surf the Internet for any information you need in a short time without working hard in the library. And it is also very convenient to communicate with others by using the Internet. However, other students think that there is some information on line that is not good for the students. In addition, spending too much time playing games on line will not only have a bad effect on study but also do harm to our health. Therefore, we should make proper use of the Internet. It is of great importance for us to separate good plants from wild weeds.
Thank you