A : Do you know much about computers?
B : Not a great deal.
A : I've just been reading an article about them. They are used for all sorts of things now.
B : For accounting systems （会计系统） and things you mean?
A : Yes, but they're used for other things too. Do you remember when we went to buy our tickets for The Flight To Greece ?
B : Yes.
A : The man asked where we wanted to go, then he typed out the information on a form and waited for a reply. A few moments later he gave us our tickets.
B : Of course. His machine must have been connected （连接） to a computer.
A : That's right. Do you play computer games?

B : Not much. I think it's not good for us. We should study well.

A : That's right, computer has a good side and a bad side. Playing much computer games wastes our time.

B : So we must make good use of the computer.