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  3. Computers have been taught to play not only checkers, but also championship chess, which is a fairly accurate yardstick for meas

Computers have been taught to play not only checkers, but also championship chess, which is a fairly accurate yardstick for meas

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问题     Computers have been taught to play not only checkers, but also championship chess, which is a fairly accurate yardstick for measuring the computer’s progress in the ability to learn from experience.
    Because the game requires logical reasoning, chess would seem to be perfectly suited to the computer. All a programmer has to do is to give the computer a program evaluating the consequences of every possible response to every possible move, and the computer will win every time. In theory this is a sensible approach; in practice it is impossible. Today, a powerful computer can analyze 40 000 moves a second. That is an impressive speed. But there are an astronomical number of possible moves in chess-- literally trillions. Even if such a program were written (and in theory it could be, given enough people and enough time), there is no computer capable of holding that much data.
    Therefore, if the computer is to compete at championship levels, it must be programmed to function with less than complete data. It must be able to learn from experience, to modify its own program, to deal with a relatively unstructured situation —in a word, to "think" for itself. In fact, this can be done. Chess-playing computers have yet to defeat world champion chess players, but several have beaten human players of only slightly lower ranks. The computers have had programs to carry them through the early, mechanical stages of their chess games. But they have gone on from there to reason and learn, and sometimes to win the game.
    There are other proofs that computers can be programmed to learn, but this example is sufficient to demonstrate the point. Granted, winning a game of chess is not an earthshaking event even when a computer does it. But there are many serious human problems, which can be fruitfully approached as games. The Defense Department uses computers to play war games and work out strategies for dealing with international tensions. Other problems --international and interpersonal relations, ecology and economics, and the ever-increasing threat of world famine can perhaps be solved by the joint efforts of human beings and truly intelligent computers.
In the author’s opinion,  ______.
选项 A、playing chess shows computer’s program has been developed into a new stage
B、it is practically possible now that computer can win every chess game now
C、computers even with less than complete data can be programmed to defeat the world champion chess player______.
D、computers can be programmed to play and reason but not learn
答案A
解析 文章中第一段，“Computers have been taught to play not only checkers，but also championship chess，which is a fairly accurate yardstick for measuring the computer’s progress in the ability to learn from experience”表明计算机不仅能够跟一般棋手下棋，而且能够跟世界冠军下棋这是计算机取得进步的里程碑，因为计算机可以具有通过经验学习的能力了。其中yardstick 表示里程碑，和选择项A中的develop in to a new stage相符，因此选A。对于选择项B，文章第二段第三句“In theory this is a sensible approach；in practice it is impossible”说明计算机要每局必赢在理论上是可行的，但是在实践上是不可行的。因此，B要排除。文章第三段的第一句“Therefore，if the computer is to compete at championship levels，it must be programmed to function with less than complete data”表明如果计算机要与世界冠军相抗衡，它的程序中的资料也是不全的。这就说明答案C是不符合题意的。文章最后一段第一句“There are other proofs that computers can be programmed to learn”论证了选择项D的错误，因为D computers can be programmed to play and reason but not learn 认为计算机只能用于玩耍和推理，而没有学习的能力，这与原文是相左的。所以答案选A  playing championship chess shows computer’s program has been developed into a new stage．
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