It is so precious a picture that it is kept in a sealed box.

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• Look at the picture. It is a nice classroom. In the picture, you can see the teacher's desk, ten desks and chairs. You can see a boy and three girls.

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• Robot. It is a word that seems very modem. A word that creates a strong mental picture. A picture of something that looks and acts like a human. Robots are not human, of course. They are machines.

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• Mark Twain once observed that giving up smoking is easy. He knew, because he'd done it hundreds of times himself. Giving up for ever is a trifle more difficult, apparently, and it is well known that it is much more difficult for some people than for others. Why is this so？

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