What is the main idea of this passage?
A The best schools teach a variety of subjects.
BEducation and schooling are quite different experiences.
A. The more years students go to schools, the better their education.
B. Students benefit from schools, which require bong hours and homework.
19Since 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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