单项选择题

The oldest kind of computer, the abacus, has been used since （）

A．600
B．700
C．800
D．500

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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
单项选择题
The computations of the computer are measured in （）

A．seconds
B．microseconds
C．milliseconds
D．nanoseconds
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