未知题型 计算机中，负责指挥计算机各部分自动协调一致地进行工作的部件是　　A.运算器　　B.控制器　　C.存储器　　D.总线

单项选择题 （）是天生的民主派。

未知题型 听力原文：W: Hi, David. I haven't seen you for ages. How are you getting along with your work?M: Hi, Susan. Not so well as to be expected. I've left my position. I can't bear the rudeness of my boss any longer.W: What are you going to do then?M: No idea. Anyway, I've got to think about it seriously. And you?W: I've been very successful as a dancer. I like this kind of life. It is so exciting.M: You can't do that forever.W: No. But I've decided to open a dance school once I've moved to the top. A lot of young dancers need better training.M: That's a wonderful idea.What does the man do now?A．A teacher.B．A dancer.C．Neither of the above.