单项选择题

Which of the following is a reason for people' s growing interest in natural foods

A．They want to return to nature.
B．They want to eat all kinds of foods.
C．Natural foods are very delicious.
D．They are more health conscious.
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单项选择题
Which of the following is NOT mentioned in the passage
A．Chickens are fed on food which is little better than garbage.
B．Chickens live in very crowded condition.
C．The eggs chickens produce lack vitamins.
D．Chickens are free to move about.
单项选择题
Food that is rich in organic matter_________.
A．has been nourished by fertilizers
B．contains vegetable matter that has not been consumed
C．has had chemicals and fertilizer added to it
D．contains large quantifies of vitamins
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