单项选择题

This article is mainly about ______.

A．color blindness
B．color differences.
C．color psychology.
D．color discoveries.
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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
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
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