Humus is decayed organic matter that is an important element of fertile soil.

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问题 Humus is decayed organic matter that is an important element of fertile soil.

选项 A、derived
B、compacted
C、decomposed
D、liquefied

答案C

解析 句意:腐殖质是腐烂了的有机物,它是肥沃土壤中的一种重要元素。decayed腐烂了的。decomposed已腐烂的,已分解的。derive得自,起源。compacted紧凑的,紧密的。liquefied溶解的。
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