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

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

The expression a bird's-eye view means______.

A．to see with bird's eyes
B．a bird looks at a beautiful view
C．a survey from a high position looking down
D．a famous place with beautiful scenery