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
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单项选择题
Huskless, milled rice ______.
A．was cheaper than unmilled rice
B．was less nourishing than unmilled rice
C．was more nourishing than unmilled rice
D．cured beri-beri
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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