A. the advantages and disadvantages of using the mobile phone B. the manners of using the mobile phone C. the problems brought by the mobile phone D. the development of the mobile phone industry 参考答案:C 答案解析:[解析] 全局题。尽管本文首段先介绍了手机给人们带来的便利,但讲述手机的优点并非本文的重点,这部分起引出下文的作用。根据后面段落的内容,可判断本文主要讨论了手机给人们带来的问题。