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
She（）have missed the first bus, or she（）be here so early.

A．needn't, shouldn't
B．couldn't can't
C．shouldn't, mayn't
D．mustn't, wouldn't
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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