With development of science and technology, great changes have taken place in out lives . In my opinion, science is both an angel and a monster, since it brings us both benefits and harm . Let;s take computer for example, Nowdays , computer is very important in our lives and it has brought great benefits in areas such as education, nedicine and some public services .For instance, with the help of computer system, we , college students , anr able to learn a lot of scientific and technical knowledge without teachers .By turning to the Internet , we can get an e-mail from our friends and parents . Another example is that many big cities 's traffic systems are mainly controlled by the computer now , and the the traffic order has become much better . So in daily life , we really can't do without computer.However, we have also found a lot about the negative effects of computer . For example, compter virus has caused many problems .Many children are so carried away by cartoons and computer games that they neglect their studies .
Anyhow , I believe human can solve these problems cansed by computer and make computer more useful in the future .