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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热门试题

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

According to the author it is not desirable to ______ by traveling on foot.

A．lose the kind of experience
B．enjoy the present as a reality
C．have a sound and satisfying sleep
D．become physically tired