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
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单项选择题
What information CANNOT be obtained from the UPC
What information CANNOT be obtained from the UPC
单项选择题
The Universal Product Code______.
A．makes grocery shopping easier
B．makes grocery shopping complicated
C．cuts down on efficiency
D．will never be practical
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