Though computers have some disadvantages,indeed,computers play an important role  in our life nowadays.
         As a student, i always search information on the Internet.It's a cheap and convenient way for me to learn other things which can't be learnt in the class.It open my eyes and enrich my life.Moreover,using e-mail, QQ and blog to communicate with classmates,friends and relatives is cheapper than using telephone and other devices.
         Besides,computers could measure brain activity to determine the quality of our work. Doctors will use computers to evaluate and treat sickness. Computers in cars will show our routs, take money from our bank accounts, identify motor problems,figure out repair costs and locate repair shops and so on .
         In a word, excellent!