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
The chickens Eijkman noticed in the hospital yard______.
A．couldn't digest the huskless rice
B．proved beriberi is transmitted by germs
C．were later cooked for the patients' food
D．were suffering from vitamin deficiency
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