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
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单项选择题
Which of the following describes the main idea of the passage
A．Computers are stupid and inefficient.
B．Computer errors are basically human errors.
C．Computer can help department stores update the price list.
D．Supermarket price errors are often made through dishonesty.
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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