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

<上一题目录下一题>

热门试题

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

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