Soon, almost everyone, either at home or at work, will use some kind of computer. the lives of all of us will be changed by this invention.

　　The main idea of this passage is ____

　　A how the computer came into being

　　B that computers ate getting smaller and smaller all the time

　　C that the computer will change the lives of all of us

　　D that modern computers can be built into other machine

　　20 The computer is an electronic machine. It is a machine that solves problems as much as you do. As an example, lets trace the way you would add two numbers. Then, lets see how a computer would do it.

　　Step1. You collect information. That is, you either see or hear the numbers to be added.

　　Step2. You find a method to solve the problem. In this case, you remember how to do addition.

　　Step 3 You bring together the information , and the method

　　Step 4 You perform the operation, adding the two numbers.

　　Step5 You report the results of your work, either by writing down the answer or by saying it aloud.

　　All computers go through five similar steps.

　　Step 1 The computer receives information, or data, from the outside. It changes the data into electric language, called input.

　　Step 2 The computer has been given a program contain instructions for solving the problem. The instructions ate found in the storage or memory.

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