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单项选择题

A computer is a machine designed to ______.

A．perform work mathematically
B．perform complicated calculations
C．store and select information
D．all of the above
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单项选择题The essential role played by computers lies in ______.

A．automation processes
B．mathematical computations
C．traffic control
D．the development of mathematical theory

单项选择题The difference between fact' and theory ______.

A．is that the latter needs confirmation
B．rests on the simplicity of the former
C．is the one between old Greeks and modem scientists
D．helps us know deduction