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
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
单项选择题
Dachshunds are funny in their ______.
A．shape
B．head
C．habit
D．mischief
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