高中英语第一册Unit 3 Computer教案
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.