8
本句中，句型It is up to sb. to do sth.的意思是“由某人来做某事”。请看下例：
It is not up to you to decide what you should do next.
下一步该做什么你们说了不算。
significance的意思是“意义，重要性”；nothing but等于nothing else than，意思是“只，不过”。请看下例： 电位器旋钮What he said is of no significance, nothing but nonsense.
他说的话毫无意义，简直就是一派胡言。
[6] Since data is constantly being worked on, reducing the need to access main memory, which is often slow compared to the ALU and control units, greatly increases the computer’s speed.
本句中，since data is constantly being worked on是一个原因状语从句；reducing the need to access m
ain memory是动名词短语作主语；which is often slow compared to the ALU and control units 是一个非限定性定语从句，对main memory进行补充说明，which指main memory。
Exercises
〖Ex. 1〗根据课文内容回答问题
(1) How many main sections does a general-purpose computer have? What are they? And how are they interconnected?
(2) What is the control unit often called?
(3) Please list the functions of the control system.
(4) What are the two classes of operations ALU is capable of performing?
(5) What do logic operations involve?
三维激光扫描系统(6) What can a computer’s memory be viewed as? What does each of them have?
(7) What are the two principal varieties of computer main memory?
(8) In a PC, what does the specialized program called BIOS do?
(9) Why is the software that is stored in ROM often called firmware?
(10) What is I/O?
〖Ex. 2〗根据下面的英文解释，写出相应的英文词汇 (1) : Information put into a communications system for transmission or into a computer system for processing.
负离子灯>电缆接头闵彬管业(2) : An integrated circuit that contains the entire central processing unit of a computer on a single chip.洗衣机水嘴
(3) : An instruction sequence in programmed instruction.
(4) : A parallel circuit that connects the major components of a computer, allowing the transfer of electric impulses from one connected component to any other.
(5) : A computer and the associated physical equipment directly involved in the performance of data-processing or communications functions.
(6) : A unit of a computer that preserves data for retrieval.
(7) : The information produced by a computer from a specific input.
rrggg
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议