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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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
This passage mainly deals with ______.
A．food storage
B．advantages of canned food
C．the art of canning
D．canning food
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