单选题:Soilthatisrichinorganicmatters(  ).

题目内容:

Soilthatisrichinorganicmatters(  ). A.hashadchemicalsandfertilizersaddedtoit
B.containsvegetablematterthathasnotbeenconsumed
C.hasbeennourishedbyfertilizers
D.alreadycontainslargequantitiesofvitaminsandminerals

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答案解析:

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