单项选择题

According to the passage, if the price in the machine is too high, the cause(s) may be______.

A．a computer error
B．carelessness
C．dishonesty
D．B or C
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单项选择题
Grocery store price lists are updated by______.
A．a scanner
B．a telephone hookup
C．an adding machine
D．an employee
单项选择题
We are told that a high-tech cash register is really just______.
A．an electric instrument of sight.
B．a simple adding machine.
C．a way to keep employees honest.
D．an expensive piece of window dressin
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