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高中英语必修二unit3课件


Guess!

A handbag?

A toy?

Guess more:
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.

Do you know who I am?

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?

calculator

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 for you to take me with you.

Do you know who I am? notebook computer

A huge computer

Palmtop(掌上型电脑)

A PC

Who am I ?

Skimming: Go over the story to find out
who the speaker is. Write down 3 sentences to It is a computer. support your idea. ● I was built as an Analytical Machine by Charles Babbage.” ●”My real father was Alan Turing ....” ● I was able to share my knowledge with others through the World Wide Web.

Scanning:
1642
1822

Timeline

The computer began as a calculating machine.

The Analytical Machine was made by Charles Babbage. 1936 Alan Turing wrote a book to describe how computers could be made to work. 1940s Computers had grown as large as a room. The first family of computers was connected to each other. Computers were used in offices and homes. 1970s 1960s

True or False
1. Alan Turing built an Analyticalmachine to a universal Machine solve any mathematical problems. F 2. People began to realize that the computer got T cleverer and quicker with time passing. 3. The computer began to serve the human race since it was brought into people’s homes. F its birth 4. Since the 1970s, the computer was used by T people around the world through the Internet. 5. The largersmall and thin is, thegot cleverer and I became the computer but I more memory F it has. cleverer, quicker and quicker. And my memory became so large that I couldn’t believe it!

Comprehending:
1. Choose the best answers
1) What’s the main idea of the text? A. The computer wants to find “who he is”. B. The functional change of the computer. C. The computer becomes popular around the world. D. The history of the computer.

2) What can you infer from the text? A. The computer has artificial intelligence. B. The computer changes a lot over the years. C. The computer was not connected by a network until in the early 1960s. D. Now the computer can only be used to deal with information.

2. Questions
Q1: How did the computer work as an Analytical Machine? The computer followed instructions from cards with holes.

Q2: In how many ways do we say the computer changed? What are they? ? Size: smaller

? Intelligence: cleverer
? Speed: quicker ? Function: calculating----dealing with …, communicating with… ? People’ opinion: clever & useful

Consolidation: Retelling
1642 1822 1936 1940s 1960s 1970s now

began … calculating …France The Analytical Machine … Charles Babbage Alan Turing … wrote … built … As large as connected … share … talk … Become very important in … deal with … communicate …

Match the words with their meanings.
1 A monitor is 2 The screen is 3 A keyboard is 4 A mouse is 5 A CD-ROM is

6 A hard disk is

(a) the part of a computer that stores information. (b) the part of the computer that you type on. (c) the part of the computer that looks like a television (d) something you use to click on things (files, etc.). (e) the part of the monitor that you look at. (f) a separate disk that contains lots of information.

Task 2. Discussion be used for? 1.What can the computer

school work
games

emails
music and films chat

information
photos

shopping

convenient laptop
smaller desktop

palmtop

2.What about in the future?

virtual keyboards 虚拟键盘

Nose-top keyboard-vest

What about in the future?

robot

Suppose you are a reporter. Now you are interviewing Mr. / Miss Computer. Sample questions: …… ? What do you like to eat? ? What are your hobbies? ? What is your newest function(功能)? ? Can you say something about your future plan? etc.

Task 3. Role-play

Homework:
1. Review the passage 2. Do Ex. 1-3 on P19-20. 3. Read the story about Bill Gates.


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