人教版英语必修二unit3 computers warming up PPT课件

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Alan Turing
4.What were you called in 1936?
.
A universal machine
1. Read the passage and finish the timeline below.
1642 The computer began as a calculating machine.
abacus
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?
calБайду номын сангаасulator
PC laptop PDA
virtual keyboards keyboard-vest
What’s the main idea of the text? A. What a computer is. B. What a computer is used for. C. How the computer becomes popular. D. The history of the computer
Paragraph 2
Topic
These changes only became
sentence possible as my memory
improved
•tubes
Supporting •transistors
details
•chips
•network
•World Wide Web
Topic sentence
People say computers have more advantages than disadvantages. Do you think so?
A
B
advantages
Such as : Send an e-mail
disadvantages It is bad for your eyes
I am a machine, with which you can type your homework, draw pictures, play games, watch movies, listen to music, communicate with your friends, search information…
I am very old now. I was born in China. Many people used me for calculating(计 算)in the past, but I am a bit lonely because they don’t like me now.
Do you know who I am?
Do you know who I am?
computer
Unit 3
Can you put these inventions in an order according to the time when they appeared?
Calculator Huge computer
Abacus
? Robot
The first family of computers 1960s was connected to each other.
1970s
Computers and homes.
were
used
in
offices
now Computers connect people all over the world together.
1822 The analytical machine was made by Charles Babbage.
1936 The computer grew rapidly both in size and in brainpower.
1940s The computers had grown as large as a room.
Answer the following questions.
1.What does “I” in the passage refers
to?
A computer
2.Who built the first analytical machine?
Charles Babbage
3.Who was your real father?
typing homework
drawing pictures
playing games
advantages
watching movies
chatting with friends
searching information
……
listening to music
disadvantages
Indulging in playing computer games Threating people's ability of thinking Being cheated because of the virtual world Writing wrong Chinese letters
- --- - - -
Summarize what we have discussed, and write a composition.
writing
Supporting details
Paragraph 3
Since the 1970s many new applications have been found for me.
•communications • finance •trade •robots •mobile phones •medical operations •space rockets
2.Read the passage again and complete the chart below.
Topic sentence
Supporting details
Paragraph 1
Over time I have been changed quite a lot.
•calculating machine •analytical machine •universal machine •PC •laptop
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