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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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
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
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