单项选择题

Fresh fruit and vegetables______.

A．contain more vitamin C than any other food
B．decrease our resistance to colds
C．contain every kind of vitamin
D．increase our susceptibility to influenza

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热门试题

单项选择题

The ingredient missing from milled rice______.

A．was vitamin B
B．did not affected the chickens
C．was named the Eijkman vitamin
D．has never been accurately identified

单项选择题

Deficiencies of the various vitamins______.

A．cause identical diseases
B．are no; serious except in the case of vitamin C
C．cause different diseases
D．are often caused by scurvy