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【单选题】
《四千年的农民》一书中记载了中国农民几千年来的耕作方法:积极种植能够固氮的豆科作物,以及收集一切可能的有机物质,包括人畜粪便、枯枝落叶、残羹剩饭、河泥、炕土、老墙土以及农产品加工过程中的废弃物等,采用堆肥和沤肥等多种方式,把它们转变为有机肥料,施用到农田中。下列对这种做法的评价,最完整、准确的是 1改善了土壤结构 2培育了土壤微生物 3实现了土壤养分的循环利用 4改变了土壤酸碱性,使土壤板结A.
①②
B.
①②③
C.
①②③④
D.
②③
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