单项选择题

A good mixed diet ______.

A．normally contains enough vitamins
B．still needs supplementing with vitamins
C．is suitable for religious fasting
D．is often difficult to arrange
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单项选择题
The ingredient missing from milled rice ______.
A．was vitamin B
B．did not affect the chickens
C．was named the Eijkman vitamin
D．has never been accurately identified
单项选择题
The chickens Eijkman noticed in the hospital yard ______.
A．couldn't digest the huskless rice
B．proved beri-beri is transmitted by germs
C．were later cooked for the patients' food
D．were suffering from vitamin deficiency
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