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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单项选择题
Poor knowledge of the market and lack of experience （） his failure in investment.

A．resulted in
B．resulted from
C．brought in
D．brought from
问答题
A Brief Introduction to a Tourist Attraction
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