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
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 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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