单项选择题

Chickens kept in this way are not only tasteless as food, they also produce eggs which ______.

A．lack important fibres
B．lack important protein
C．lack important minerals
D．lack important vitamins
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单项选择题
It is significant that nowadays ______ considered to be an important part of a healthy diet.
A．vegetables are
B．white bread is
C．fibre is
D．unrefined flour is
单项选择题
To use chemicals and fertilizers means ______.
A．to increase the amount of foods
B．to increase the quality of foods
C．to increase the amount and quality of foods
D．to increase essential vitamins and minerals
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