单项选择题

The computer will soon affect ______.

A．people in large cities
B．people in developed countries
C．all humanity
D．the Western world
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单项选择题
The computations of the computer are measured in ______.
A．seconds
B．microseconds
C．milliseconds
D．nanoseconds
单项选择题
A stored-program computer has ______.
A．an adding machine
B．a brain
C．a finger
D．a memory
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