Recently, some people are interested in natural foods because ______. Chickens kept in this way are not only tasteless as food,

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问题 Recently, some people are interested in natural foods because ______.
Chickens kept in this way are not only tasteless as food, they also produce eggs which ______.

选项 A、lack important fibres
B、lack important protein
C、lack important minerals
D、lack important vitamins