问题 单项选择题

以下关于CISC(Complex Instruction Set Computer,复杂指令集计算机)和RISC(Reduced Instruction Set Computer,精简指令集计算机)的叙述中,错误的是 (2)

A.在CISC中,其复杂指令都采用硬布线逻辑来执行

B.采用CISC技术的CPU,其芯片设计复杂度更高

C.在RISC中,更适合采用硬布线逻辑执行指令

D.采用RISC技术,指令系统中的指令种类和寻址方式更少

答案

参考答案:A

解析: CISC可以有效地减少编泽代码中指令的数目,使取指操作所需要的内存访问数量达到最小化。此外CISC可以简化编译器结构,它在处理器指令集中包含了类似于程序没计语言结构的复杂指令,这些复杂指令减少了程序设计语言和机器语言之间的语义差别,而且简化了编译器的结构。为了支持复杂指令集,CISC通常包括一个复杂的数据通路和一个微程序控制器。
RISC(reduced instruction set computer,精简指令集计算机)是一种执行较少类型计算机指令的微处理器,起源于80年代的MIPS主机 (即RISC机),RISC机中采用的微处理器统称RISC处理器。RISC微处理器不仅精简了指令系统,采用超标量和超流水线结构;它们的指令数目只有几十条,却大大增强了并行处理能力。由于RISC处理器指令简单、采用硬布线控制逻辑、处理能力强、速度快,世界上绝大部分UNIX工作站和服务器厂商均采用RISC芯片作CPU用。

阅读理解

As a volunteer teacher, I traveled a long way to a small village school in Long Zhou, Guangxi. On my way there, I thought about the village, the school, and the children there. However, my heart sank when I arrived there. It wasn’t what I expected. It didn’t look like a school at all! The school had only three rooms, one for Grades 1, 2, and 3, and the other for Grades 4, 5 and 6. There was a third one for me.

The children welcomed me warmly on my first day. They asked me a lot of questions, and I told them stories about myself and my life in Shanghai. The next day, I gave them a test to find out their level. To my surprise, though the test was very easy, over half of the students failed it, yet they all wanted to learn new things. I knew they needed me.

I was busy preparing lessons, reading test papers every night. I enjoyed teaching these lovely and hard-working children, and I could see that they were making progress with my help. I have also learned a lot from them. I understand their lives better, and we are now good friends.

I have worked in Long Zhou for a year now. I’m very happy, and the experience has been very useful for me. I love the small village and the children. In fact, I would like to continue working here.

小题1:The writer is a volunteer teacher who comes from __________.

A.Guangxi

B.Xiamen

C.Shanghai

D.Liaoning小题2:The writer found there were only ________rooms in that school.

A.two

B.three

C.six

D. eight小题3:In the passage, “my heart sank…” means that the writer ________

A.felt upset

B.was happy

C.got angry

D. am sad小题4:The writer found the students’ level was _________ she excepted after the first test.

A.just as

B.higher than

C.lower than

D.high than小题5:Which of the following statement is NOT true?

A.Both the volunteer teacher and the students are working so hard.

B.The volunteer teacher doesn’t like to work there any longer.

C.The students became better and better with the help of the volunteer teacher.

D.The teacher is still in the school.

选择题