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 use of computers for specialized purposes depends on the______.
A．design of the computer
B．power used to operate the computer
C．difficulty of the mathematical calculations involved
D．the ability of the programmer
单项选择题
The passage implies that human beings differ from computers in that human beings
A．make fewer errors
B．do not have to be programmed
C．work more quickly
D．understand their instructions
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