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 disease'beri-beri' ______.
A．kills large numbers of western peoples
B．is a vitamin deficiency disease
C．is transmitted by diseased rice
D．can be caught from diseased chickens
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