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
19 Since the beginning of time, man has invented many interesting things. Some of these inventions, like numbers, the alphabet and the radio, have certainly changed history. Since 1946, one of the most important inventions has been the computer. It will change all our lives.
At one time it was as large as a room, and quite difficult and slow to operate. But, since the invention of the silicon ship, which is really a very very small electric circuit, computers have been greatly improved. They have become smaller, easier to use, and faster; they can store a lot more information.
Some computer are made as well as television sets. Simple computers can be made smaller than a book. And computers are getting smaller all the time.
There are several reasons why the computer is useful to us. Firstly, it can store a very very large quantity of information in its memory. Secondly, the computer can operate very quickly thousands of times faster than a humanand it will not tire. Thirdly, modern computers can be built into other kinds of machines, like radios, cars, planes and so on. They can do many kinds of work.
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