computers are uesful machines.they are widdly yesd in shops,banks,stations and many other places.with a computer,we can search for information,go shopping an line,send e-mails or bu QQ.computer have made our life more comfortable.But now more and more teengers are interested in playing computer games.They play all day and lose themselves in computer games.I think a computer is only a tool,but not a toy.As students,we let computer help us study better.