急！！！一篇关于计算机的英语文章，要求500字，主题明确！

Computer has become a major source of access to knowledge.
By computer on the Internet we can see the latest, fastest and most authoritative news, you can not learn in books of knowledge, know the unknown information more widely, also make more students faster, earlier and closer to science and technology front, it helps us to love science, advocating science.
Computer is a useful tool to enhance communication. Computer Internet chat rooms or we can OICQ chat and other communication sites in this virtual world, each talking about their favorite subject, users young or old, regardless of occupation, as long as the similar interests that can pour out their feelings. This desire for friends, friendship, desire, desire to talk to us it is a great opportunity. We are happy to talk about in the network, relax and be spiritually free.

谢谢楼主采纳 Can we leave computers now? 　　Computer is one of the greatest inventions of the 20th Century. It has not only changed the way of people's daily life, but also contributed to the forming of a totally new world in the 21st century. 　　Computer has helpt dramatically upgrade the technologies in all industrial spheres, and sharpen the arms of all big powers. Owing to computer, the wheels of time are running ever faster into an information era. Each morning, with a cup of coffee, switching on a computer and logging into one's email inbox has become millions of people's habits. 　　On the contrary, computer has also brought us unprecedented menaces. Viruses are spreading through the internet, trying to undermine your CPU at any minute. Even more horrible is that, with a little push of a button somewhere, the computer-controlled nuclear weapons can easily and diabolically ruin this very earth, hundreds and hundreds times. So, what do you say? Can we leave computers now?