单项选择题


A．began
B．listened
C．felt
D．sounded
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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
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
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