生物组织进入土壤后，经过矿质化过程分解为简单有机质。
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腐殖质化过程: 动植物残体在微生物作用下分解后再缩合和聚合成一系列黑褐色高分子有机物的过程
A. 对
B. 错
How different is the education of America from that of other countries?
What courses do public schools in America offer?
How do American students choose their curricula?
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