Unit 3 Computer

Aims

1.To talk about computer

2. To read about computer

Procedures

Step I. Warming up

Look at the pictures on page 17. What are they? What do they have in common? Yes, they are computers. Then what is a computer?

A computer is a machine which stores knowledge in its memory and does calculations on that knowledge. This knowledge is stored in symbols; it is called data. A computer usually has a monitor to show results. However, some computers can speak; these computers can be used for voice mail.

A computer frequently requires a boot device. The boot device contains the computer's operating system and data. Computer programs can be installed onto a computer. Some people think that computers are less useful if they do not have access to the Internet. They