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
Food deteriorates during storage because ______.
A．necessary chemical preservatives are totally absent from it
B．it is infected with yeasts, moulds and bacteria
C．heat sterilization destroys infections present in it
D．it isn't fit for storage
单项选择题
The word deteriorate can be replaced by ______.
A．become soft
B．go bad
C．change taste
D．turn hard
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