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高中英语 Unit3 Computers课件 新人教版必修2


A PC( personal computer)

A notebook computer

Riddles(谜语):
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

Riddles(谜语):
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

Riddles(谜语):
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 / laptop

A huge computer

PDA / Palmtop

A PC

Discussion
what can we use computer to do? Work out a list and compare it with your partner.

send emails

……

play games
do shopping online

Internet watch movies communicate with my friends.

gather listen to information for music my lessons

Reading

Who am I ?

How much do you know
about a computer? Pictures and words

Label each part
1

2

3

the main device 6 that a computer uses to store information. the part of a computer that stores information

5

4

1. monitor 2. screen 4. mouse 5. keyboard

3. CD-ROM 6. hard disk

5

1

3 device linking a computer with a telephone line.
1.modem 2.scanner

2

3.printer
4.chips

4

5.CPU

Skimming: Listen to the tape and answer the following questions.

1.Who is the teller of the story?

Computer.
2.What does the passage mainly talk about?

It talks about the history and the applications (Use) of computers.

3. In which order is the text organized?
Time

Timeline
The computer began as a calculating machine 1642:_____________________________________ 1822:The Analytical Machine was made by Charles Babbage. computer grew rapidly both in size and in 1936 _____: The _______________________________________ brainpower. __________________ The computer had grown as large as a room. 1940s: _______________________________________ 1960s _____:The first family of computers was connected to each other. Computers were used in offices and homes 1970s:_____________________________________ Computers connect people all over the world Now:________________________________________ together. ___________________________

Para. 1
? Topic sentence: Over time I have changed quite a lot. ? Supporting details: ? calculating machine ? analytical machine ? universal machine ? a huge computer ? PC ? laptop

Para. 2
? Topic sentence: These changes only became possible as my memory improved. ? Supporting details: ? tubes ? transistors ? chips ? network ? World Wide Web

intelligent but lonely

Para. 3
? ? ? ? ? ? ? ? ? ? Since the 1970s many new Topic sentence: applications have been found for me. Supporting details: communications finance trade robots mobile phones medical operations space rockets providing a life of high quality

How did computer change in its size, intelligence, speed, function? And how about people’s opinion? Size: smaller cleverer

Intelligence:
Speed:

quicker

dealing with …, calculating? Function: communicating with… clever simple-minded? & useful People’s opinion:

Discussion
1.What can the future computer be like? 2.What can we do by computer in the future?

virtual keyboards 虚拟键盘

Nose-top keyboard-vest

You are given a chance to design a computer for yourself.
Draw a picture about it and describe(描述) what functions it has. You will be asked to introduce(介绍) your computer. (appearance &functions)


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