Question

简答题

　　The more time scientists spend designing computers, the more they wonder at human brain．Tasks that puzzle the most advanced supercomputer-recognizing a face, reading a handwritten note-are child’s play for the 3-pound organ．Most important,unlike any ordinary computer, the brain can learn from its mistakes．Researchers have tried for years to program computers to imitate the brain’s abilities, but without success．Now a growing number of designers believe they have the answer：if a computer is to work more like a person and less 1ike an over-grown calculator it must be built more like a brain, which distributes information across a vast interconnected web of nerve cells or neurons．

　　Ordinary computers work by following a chainlike sequence of detailed instructions．A1though very fast, their processors can perform only one task at a time．This approach works best in solving problems that can be broken down into simpler logical pieces．The processors in a neural-network computer,by contrast,form a network much like the nerve cells in the brain．Since these artificial(人造的)．neurons are interconnected,they can share information and perform tasks at the same time．This two-dimensional approach works best at recognizing patterns．

　　Instead of programming a neural-network computer to make decisions, its maker trains it to recognize patterns in any solution to a problem by repeatedly feeding examples to the machine．

　　Neural networks come in all shapes and sizes．Until now most exist as software simulations(模拟品)because redesigning computer chips took a lot of time and money．By experimenting with different approaches through software rather than hardware, scientists have been able to avoid costly mistakes．

1．What does the expression“this two-dimensional approach”in Paragraph 2 refer to?(回答字数不超过6个)

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2．According to the passage, what is the main difference between human brain and ordinary computers?(回答字数不超过10个)

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3．Why do scientists use software instead of hardware in their experiments?(回答字数不超过8个)

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Answer 1

答案：
解析：

　　1．Sharing information and performing tasks．

　　2．Human brain can learn from mistakes．/Human brain distributes information across an interconnected web of neurons

　　3．Because it can save much time and money．/To save much time and money