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
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单项选择题
All of the following are the steps of canning food except ______.
A．cleaning and trimming raw food
B．sterilizing canned food
C．blanching vegetables that are to be calmed
D．printing labels and packing the tins into boxes
单项选择题
Food canning technology makes it possible to______.
A．increase the amount of food products.
B．make food more delicious
C．eat previously seasonal food at any time
D．grow strange plants
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