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
The word deteriorate can be replaced by ______.
A．become soft
B．go bad
C．change taste
D．turn hard
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
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