单项选择题

Computer 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．a laser beam of light
C．the customers themselves
D．the cash register
单项选择题
A possible title for this article could be ______.
A．Animals and Food
B．The Benefits of the Universal Product Code
C．Production Made Easy
D．Stripes in Food Advertising
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