1)在开头出现;

　　2)在结尾出现;

　　3)在开头和结尾同时出现，首尾呼应;

　　4)有些文章的中心思想贯穿全文，并没有用一句话明确表达出来，这就要求学生学会归纳概括。

　　(三)实战演练

　　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.

　　Step 3 The computer bring together the data from the input and the instructions from the storage. This is done by the computers control.

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