单项选择题

According to the passage, computers play an essential role in______.

A．automation
B．mathematical computations
C．traffic control
D．the development of mathematical theory
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单项选择题
The speed with which an electronic computer works depends on its______.
A．electronic circuits
B．programmer
C．vacuum tubes, or transistors
D．instructions
单项选择题
The difference in time between zones is______.
A．twenty-four hours
B．seven days
C．one hour
D．more than seven days
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