今天人们最时髦的话题就是网络，“你上网了没有”已经是人们见面的问候语。原来，Internet将世界各地的人们联系在一起，跨越了国家的局限和空间的限制，但Internet并不神秘。　　我国在几年前就加入了Internet。目前，在我国同时存在着几个同Internet相联的网络，其中规模最 Today’s most fashionable topic is the Internet, “you have access to the Internet” is already a greeting for people to meet. It turned out that the Internet will be people all over the world together, across the country’s limitations and space constraints, but the Internet is not mysterious. My country joined the Internet a few years ago. At present, there are several networks connected to the Internet in China, of which the largest