单选题:Most rainforest soils are thin and poor because (  ).

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  • 题目类型:单选题
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题目内容:
Most rainforest soils are thin and poor because (  ). A.the composition of the topsoil is rather unstable
B.black carbon is washed away by heavy rains
C.organic matter is quickly lost due to heat and rain
D.long-term farming has exhausted the ingredients essential to plant growth
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