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Unit One
I. Useful Words
switch on v. 打开
program n. 程序
instruction n. 指令
execute v. 执行
describe v. 描绘
electronic adj. 电子的
circuit n. 电路
II. Key Sentences
1. The centre of a computer is CPU.
计算机的中心是中央处理器。
2. We can’t imagine what the world would be like without computers.
没有电脑，我们无法相象世界会是什么样子。
3. A computer can calculate at a very high speed..
计算机能够以很高的速度进行运算。
4. Only when you know how to switch it on, can you use the computer.
只有知道如何开机，你才能使用电脑。
5. Computers can solve problems for people by carrying out instructions given to them.
电脑执行人们输给的指令来解决问题。
6. Under the control of the program, computers even can do some great things.
在程序的控制下，电脑甚至能够做出一些惊人的事情。
7. Computers have circuits which can make decides.
电脑上安装有做出各种决定的电路。
III. Situational Dialogue
你和你的一个朋友在谈论计算机，试着根据所给的情景完成下面的对话。
A: Do you think what a computer is?
B: In my opinion, it is _________________________(电子大脑).
It can ____________________(处理各种各样的问题).
A: ________________________________(你擅长使用它吗？).
B: I’ve passed National Computer Test Grace-4.
A: Then you’ll be easy to find a joy with __________________(计算机证书).
IV. Reading
What is a computer? Generally speaking, a computer is an electronic and machinery equipment, which has many uses, such as accepting, storing, and representing information. It can replace people in dull, time-consuming, routine tasks．???
Computers can store and process not only letters－numbers and characters but also sounds，image, and information of other forms．Though they cannot make suggestions for people, they can do calculating, communicating, word-processing, information searching and some other management. Under the control of the program, computers even can do some great things．
The reason why computers can work in a rather high speed is very simple: It is an electronic ma-chine．For example, as soon as you turn on the switch the light gets light at the same time．How fast the speed of the current is! Computers do various kinds
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