单项选择题

Computers are beneficial because they ______.

A．eliminate price errors
B．give itemized printout to the customer
C．save time in the checkout lane and help control inventory
D．all of the above
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单项选择题
Codes are scanned by ______.
A．the checkout clerk
B．the customers themselves
C．a laser beam of light
D．the cash register
单项选择题
What information CANNOT be obtained from the UPC
What information CANNOT be obtained from the UPC
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