第30题: [单项选择]Which of the following statements is true about Gnutella A. It is causing troubles for campus computer system. B. It designs an easy and open environment to share information. C. It is difficult to install. D. It is designed in the popular MP3 format. 参考答案:B 答案解析:[解析]事实细节题。依据第二段第一句:一个叫做Gnutella的破坏性小程序使Internet成为an easy to-use and open environment to share inform