单选题：Soil that is rich in organic matters __________.

题目分类：成人英语三级
题目类型：单选题
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题目内容：

Soil that is rich in organic matters __________. A．has had chemicals and fertilizers added to it
B．contains vegetable matter that has not been consumed
C．has been nourished by fertilizers
D．already contains large quantities of vitamins and minerals

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