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Each day, computers help millions of people do their jobs more effectively. For example, they can he...

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computer science courses in high schools  businessmen and women who use pocket calculators  maintenance(连续不断) checks on computers  companies which depend entirely on computers  
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be reasonably doubtful about them  check ail their answers  substitute them for basic thinking  use them for business purpose only  
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To look back to the early days of computers.  To explain what technical problems may occur with computers.  To discourage unnecessary investment in computers.  To warn against the blindness to the probable shortcomings of computers.  
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