单项选择题 SECTION A CONVERSATIONSDirections: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow.听力原文：Interviewer: Hello, Nancy. I know you are one of the few women taxi drivers in the city now and you drive for a living. What makes you want to become a taxi driver in the first place?Nancy: I took pride I driving well even when I was young, for I had to wait until I had a car to learn to drive. When I finally learned, it was something I really enjoyed and still enjoy, I remember how smart those taxi drivers had seemed driving so well and dressed so nearly in their uniforms. And I thought I'd like to do that myself. You really enjoy driving, I see. And how long have you been a taxi driver?N: Err.. . altogether 12 years.I: It has been quite some time already, hasn't it ?N: Yeah.E Then, what did you find the most difficult about becoming a taxi driver?N: I can still remember when I was learning to drive. It was scary. I did not yet know how to judge distance, and when a truck came near, it seemed like its wheel would just come right over mc. Anyway soon learned to judge distance. I began looking ahead, stopped worrying about the truck what was moving on either side.I: What's the best part of your job?N: I found that what I liked the best about this job was being outdoors, seeing how the city changes from season to season, and there are places I've seen that I would probably never have seen in another job. And I love all kinds of weather. I' d like to leave the window down in a fine rain. And the beautiful sceneries, you know...Nancy became a taxi driver becauseA．she owned a carB．she drove wellC．she liked drivers' uniformsD．it was her childhood dream

单项选择题 虚拟存储中遇到的一个问题是，当页表存在主存储器中而需要进行地址映射时，会产生瓶颈。下述哪一种超高速缓冲器可用来解决这一问题?( ) Ⅰ．TB(Translation Buffer) Ⅱ．TLB(Translation—Lookaside Buffer) Ⅲ．FPT(Fast Page Table)A．只有ⅠB．Ⅰ和ⅡC．Ⅱ和ⅢD．Ⅰ，Ⅱ和Ⅲ

单项选择题 下面是有关PC系统总线的叙述： ①总线涉及各部件之间的接口，和信息交换规程，它与系统如何扩展硬件结构密切相关 ②系统总线上有三类信号：数据信号、地址信号和控制信号 ③ISA 总线16位总线，数据传输速率仅为5MB/s，已经淘汰不再使用 ④PCI 局部总线是32位总线，数据传输速率达133MB/s，目前在PC中得到广泛应用其中不正确的是( )。