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
Vacuum packing is to ______.
A．immerse food in very hot or boiling water
B．sterilize food
C．remove air from the cans
D．subject food to steam or boiling water
单项选择题
According to the passage, the problems cell phone industry is faced with involve the following EXCEPT ______.
A．lack of the capacity to handle calls on wireless systems due to the greatly increasing phone users
B．the plunge in prices for wireless service
C．lack of call centers to deal with the customers' complaints
D．the technical complexity of sending and receiving wireless calls
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