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.
, r/ j! G! h& O; t4 QStep1. You collect information. That is, you either see or hear the numbers to be added.
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Step2. You find a method to solve the problem. In this case, you remember how to do addition.7 U& V: J8 q2 \& u
$ q& V' b* A9 u0 H3 d/ Z Step 3 You bring together the information (the two numbers), and the method (addition)
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Step 4 You perform the operation, adding the two numbers.
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Step5 You report the results of your work, either by writing down the answer or by saying it aloud.. U5 l& c6 g" A7 [8 T3 i3 a
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All computers go through five similar steps.
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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.
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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.* w5 s0 _. Z" P4 k, p' O* Y5 j V
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Step 4 The computer goes through the steps of the instructions on the data; this is called processing.+ B6 ? k# }9 G$ k( t
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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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8 ?2 o# c$ U l4 x2 I 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?
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A The computer is an electric machine.
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B Computer solve problems in the same way as people do
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C How we add two numbers( i' J% U! _" a6 ~& y) l! m* [3 ?
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D Computers have five parts together in one unit.) w6 d1 j2 m& q8 O- g
Key:B |
发表于 2012-8-14 09:52:33
