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Can a computer think?That depends on what you mean by ’think’.If solving a mathematical problem is ’thinking’,then a computer can ’think’and do so much faster than a man.Most mathematical problems can be solved quite mechanically by repeating certain straightforward processes over and over again.Even the simple computers of today can be geared for that.
It is frequently said that computers solve problems only because they are ’programmed’to do so.They can only do what men have them do.One must remember that human beings also can only do what they are ’programmed’to do.Our genes ’program’us.
Our ’program’is so much more enormously complex,though,that we might like to define ’thinking’in terms of the creativity that goes into writing a great play or composing a great symphony,into developing a brilliant scientific theory or a profound moral judgment.In that sense,computers certainly can’t think and neither can most humans.
Surely,though,if a computer can be made complex enough,it can be as creative as we.If it could be made as complete as a human brain,it could be the equivalent of a human brain and do whatever a human brain can do.
But how lung will it take to build a computer complex enough to duplicate(复制)the human brain?Perhaps not as long as some think.Long before we approach a computer as complex as our brain,we will perhaps build a computer that is at least complex enough to design another computer more complex than itself.This more complex computer could design one still more complex and so on.
In other words,once we pass a certain critical point,the computers take over and there is a ’complexity explosion’.In a very short time thereafter,computers may exist that not only duplicate the human brain but far go beyond it.

What information about computers can we get from the passage?()

A.They are simple and they operate mechanically.
B.They can solve all kinds of difficult problems.
C.Computers are so advanced that they will control human being someday in the future.
D.They are not as complicated as human brain.

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听力原文:M: Hi, Grace. Mind if I cat lunch with you?W: No. Mr. Evans, not at all.M: Thanks. I just beard that you're studying nutrition and you've got quite a bit of experiences working in the cafeteria, so I wonder if you will be interested in a small project we are doing this germ.W: What's the project all about?M: More and more students have been deciding not to buy the meal here and we want to attract them back. So I want to hear what students would like. Your job would be to find out.W: Well, if the menus were changed, then maybe I wouldn't have to listen to so much criticism.M: That makes you perfect for the job. Would you be interested?W: I'm not sure. What sorts of changes are you thinking of?M: I'd like to make some changes in the way we prepare our food. For example, just look at what we have to choose from today. You got a fried hamburger and I got fried chicken; They both contain too much fat.W: But you'd better not get rid of them. They're everybody's favorite.M: Well, we can certainly keep them, but we need to give the people who are health-conscious some choices. For example, we could also prepare chicken without the fatty skin and serve it on some rice with a light sauce. Do you think that would appeal to students?W: Well, I'd like that. You're right. You'd better find out what others think. Sorry, I've got to get hack to work. I'd like to hear more though. I'll drop by your office later.M: OK. See you then.(23)A.The size of the cafeteria.B.The food served in the cafeteria.C.The cost of meals in the cafeteria.D.Career opportunities in cafeterias.
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