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
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单项选择题
The disease beriberi ______.
A．kills a large number of western people
B．is a vitamin deficiency disease
C．is transmitted by diseased rice
D．can be caught from diseased chickens
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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