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
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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
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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