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
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单项选择题
Fresh fruit and vegetables______.
A．contain more vitamin C than any other food
B．decrease our resistance to colds
C．contain every kind of vitamin
D．increase our susceptibility to influenza
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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