单项选择题

This passage is mainly about ______.

A．food storage
B．advantages of canned food
C．the art of canning
D．canning food
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单项选择题
According to the passage, the complaints of American customers about the cell phone are showed in the following statements EXCEPT ______.
A．they can not listen to the voice clearly
B．the phone is cut off while they are communicating
C．the prices for wireless service are high
D．the cell phone is never connected in some places
单项选择题
Which of the following is the best title for the passage
A．A Victim of Its Own Success
B．Traditional and Modem Communication
C．Unsatisfactory Wireless System
D．Customer Service in Communication
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