解析：选B。作者意在表明只有自己才可以改变自己，自己是唯一一个对自己人生“负责”的人，任何人无法取代。

　　Ⅲ.阅读理解

　　Words：362　难度系数：★★　建议用时：8分钟

　　In so many ways，cyberspace(网络空间) mirrors the real world.People ask for information，play games，and share hobby tips.Others buy and sell products.Still others look for friendship，or even love.

　　Some Internet users want more than just someone to chat with.They’re looking for serious love relationships.Is cyberspace a good place to find love? That answer depends on whom you ask.Some of these relationships actually succeed.Others end in tears.

　　Unlike the real world，however，your knowledge about a person is limited to words on a computer screen.Identity and appearance mean very little in cyberspace.Rather，a person’s thoughts or at least the thoughts they type are what really counts.So even the shyest person can become a chat room star.

　　Usually，this “faceless” communication doesn’t create problems.Identity doesn’t really matter when you’re in a chat room discussing politics or hobbies.In fact，this emphasis on the ideas themselves makes the Internet a great place for exciting conversation.Where else can so many people come together to chat?

　　Supporters of online relationships claim that the Internet allows couples to know how intelligent they are first.Personal appearance doesn’t get in the way.

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