必修2 Unit 3 computers reading课件(23张)

Unit 3
computers

Give you some riddles and try to guess what they are .
Step1 Lead in


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 don’t like me now.
abacus
Riddles:





1+2+3+5+6+7+8+9+11+12+13+14+15+16+17+19+20=?

I am very small. I can be used for calculating. In China, some people use me when solving mathematical problems.
calculator
Riddles:

I am built to solve some mathematical problems. But I’m too big.
a huge computer

Riddles:
I’m a machine which can be used to solve all kinds of problems, such as typing your homework, drawing pictures, gathering information , buying things and so on. What’s more, I’m widely used now.
a PC (desktop) /
(personal computer)
Riddles:
I can be used for 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 I’m small enough like a book for you to take me conveniently with you .

notebook computer (laptop)
Riddles:
What do they have in common?






What’s next?

hacker
screen savers
firewall
homepage
hardware
software
virus
website
Related computer words
WWW
Blog






download

update







text

How do you use computers and the Internet?
1.Help to do homework
2.Play computer games
3.Send e-mails
4.Listen to music
5.See movies
6.Chat
7.Search for information
8.Do shopping
9.Learn computer skills/ English
I often use a computer to…, I sometimes use it to…, and I never use it to…
Reading
1、Who Am “I”?

2、Main idea?




计算机器
分析机
穿孔卡
技术革命
通用机器
数学问题
人工智能
晶体管
存储容量
网络
万维网
calculating machine
Analytical Machine
card with holes
technological revolution
universal machine
mathematical problems
artificial intelligence
transistor
memory
network
World Wide Web
New words and expressions
Task 1：skimming
1. Who am I?

2. What’s the general idea of this passage?
The history and development of computers as well as their applications.


3. Which kind of figure of speech is chiefly used in this passage?
Personification

4. How is the passage organized?
Chronological order.






1642
1822



1936



1940s
Task 2： Scanning---complete the timeline
calculating machine
grew as large as a room
1960s
1970s



analytical machine
grew rapidly in size and brainpower



smaller & was connected to each other



were used in offices and homes
now



connect people all over the world
Which is the biggest step?

Task 3 Detailed reading
Paragraph 1
Paragraph 2
Paragraph 3
Over time I have changed quite a lot.
These changes only became possible as my memory improved.
Since the 1970s many new applications have been found for me.
Find out the topic sentence of each paragragh
supporting details
Paragraph 1
Over time I have changed quite a lot.
Calculating machine Analytical machine
Universal machine PC laptop
Paragraph 2
These changes only became possible as my memory improved.
Tubes Transistors Chips Network World wide web
Paragraph 3
Since the 1970s many new applications have been found for me.
Communication Finance Trade Robots Mobile phones Medical operations Space rockets Providing a life of high
quality
What can we infer from the text ?
A computer can take the place of the human race
to do any work in the future
B. The smaller a computer is, the faster it calculates.
C. Computers can solve all the problems of the human race
D. People can benefit more from computers in the future.
Fill in the blanks
I, the _________, began ___ a calculating machine
in 1642 in _______. It took nearly two hundred years ______ I was built as an analytical machine. In 1936, I became a “universal machine” to _____any mathematical problem. However, as time _________, I was made smaller and smaller. I was given a family_________ by a network. I was able to _____ my knowledge with others _________ the www.
I have been widely used in many fields, such as in communication, ______, trade and medical ________. I have also been put into robots to _______the Moon and Mars. I’m glad I’m a ________ friend and helper of the human race.
computer
France
before
solve
went by
connected
through
share
finance
as
operations
explore
devoted
The computer began as a calculating machine in 1642. It could 1._____(simple) difficult sums. In 1936 Alan wrote a book about how the computer could be made 2. _____ (work)as a “universal machine” to solve any difficult mathematical problem. At 3. __ beginning, the computer was as large as a room, 4.___ worried the designers. As time 5.___ (go) by, it became smaller and smaller. With artificial intelligence, it is getting cleverer and cleverer, quicker and quicker. In the early 1960s, computers could 6.__________(connect) by a network, which enabled their users to share information 7.___ others. 8.____ the 1970s, computers have had many new 9.__________ (application) and have become very important in all walks of life and even 10.___________(put) into space rockets and sent to explore the Moon and Mars.
simplify
which
the
went
have been put
to work
be connected
since
with
applications
1. _________(logical) the way he used to deal with the problem is correct.
2.________(person)，I'm content with what you did.
3.Children like to read the____(simple) English stories.
4.When________(ask) for his view about his job，he said that he found it interesting.
5.The_____(apply) of robots makes difficult jobs easier to do.
7.Though the problem given by the teacher was difficult，the boy said that he could find the _______ (solve)to it.
8.He is a student with great_____(intelligent)，so I think he can do it well.
9.You needn't worry about your___(appear)—you look fine.
10.I was________(total) confused by what she said.
Homework
Tick out sentences in the text that you think are difficult for you ,and remember the new words and expressions in Unit 3.
Thank You !