题目

A new generation addiction is quickly spreading all over the world. Weboholism, a twentieth century disease, affects people from different ages. They surf the Net, use email and speak in chatrooms. They spend many hours on the computer, and it becomes a compulsive habit. They cannot stop and it affects their lives.Decades ago, no one thought that using computers could become compulsive behaviour that could affect the social and physical life of computer users. This obsessional behaviour has affected teenagers and college students. They are likely to log on computers and spend long hours at dif11．如图，在△ABC中，D、E为边AB、AC的中点，已知△ADE的面积为4，那么△ABC的面积是16．