野子苏运莹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：姬钊
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。
怎样预防校园欺凌significance的意思是“意义，重要性”；nothing but等于nothing el than，意思是“只，不过”。请看下例：鬣蜥
What he said is of no significance, nothing but nonn.
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 increas 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。
Exercis
〖Ex. 1〗根据课文内容回答问题
分别的意思
(1) How many main ctions does a general-purpo computer have? What are they? And how are they interconnected?
(2) What is the control unit often called?
(3) Plea list the functions of the control system.
(4) What are the two class of operations ALU is capable of performing?
(5) What do logic operations involve?
(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?
卤面的做法(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.
(2) : An integrated circuit that contains the entire central processing unit of a computer on a single chip.
(3) : An instruction quence in programmed instruction.黄山路线
(4) : A parallel circuit that connects the major components of a computer, allowing the transfer of electric impuls 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.
哈工大精神
(6) : A unit of a computer that prerves data for retrieval.
(7) : The information produced by a computer from a specific input.
