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New computers     all over the world.A. is used B. are using C. are used D. have used

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congratulate    celebrate    applaud    participate  
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  
challenging  psychological  dramatic  over-trnsting  
build    building    built    builds  
heavier    bigger    larger    weightier  
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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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heavier  bigger  larger  weightier  
turned up  turned out   turned down  turned over  
are playing    had played    have been playing    play  

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