2011年英语四级考试阅读主旨题解题技巧实战(20)

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The computer is an electronic machine. It is a machine that solves problems as much as you do. As an example, let’s trace the way you would add two numbers. Then, let’s see how a computer would do it.
" n& w3 p- _7 g# \& f$ ]Step1. You collect information. That is, you either see or hear the numbers to be added.
   
( u& D, Z2 o1 U0 B4 b    Step2. You find a method to solve the problem. In this case, you remember how to do addition.
   
5 {  y. W0 R' W# `* P% Q. s& x    Step 3 You bring together the information (the two numbers), and the method (addition)
   
, R% ^) k# w4 x/ z7 g    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.
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    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.
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    Step 2 The computer has been given a program contain instructions for solving the problem. The instructions ate found in the storage or memory.
   
    Step 3 The computer bring together the data from the input and the instructions from the storage. This is done by the computer’s control.
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$ |) Y4 r9 z' M. {4 r$ |    Step 4 The computer goes through the steps of the instructions on the data; this is called processing.
   
- |( R+ W( L  m9 m    Step 5 The computer changes the result from electric language to human language. It presents the results in print or sound, called output.
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    Sometimes the five parts of a computer –input, storage, control, processor , and output—are together in one large unit. Other times they are far apart and connected by wires. Often, large computers have one control and processing unit, with a number of separate memory, input, and output device.
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    What does the passage mainly tell us?
   
    A The computer is an electric machine.
   
    B Computer solve problems in the same way as people do
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    C How we add two numbers
   
    D Computers have five parts together in one unit.
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