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    【题目】某山区为了改造低产的山坡地，先是增施肥料，但农作物增产效果微弱。后将山坡地改造成水平梯田，增产效果显著。完成下列各题。

    【1】增施肥料效果微弱的最主要原因是该地

    A.土层薄 B.降水变率大 C.坡度大 D.植被覆盖率低

    【2】将山坡地改造成水平梯田，主要是为了

    A.调节大气温度 B.提高土壤肥力 C.增大空气湿度 D.增加日照时数[来

    【答案】

    【1】C

    【2】B

    【解析】

    试题分析：

    【1】根据材料，该山坡地是低产区，可能地形坡度大，水土流失多，增施肥料被冲走，效果微弱。所以最主要原因是该地坡度大，C对。土层薄是因坡度大造成的，A错。降水变率大、植被覆盖率低不是施肥效果微弱的原因，B、D错。

    【2】将山坡地改造成水平梯田，主要是为了减小土地的坡度，减少水土流失，养分元素流失少，提高土壤肥力，B对。改造对调节大气温度、增大空气湿度影响小，不能增加日照时数，A、C、D错。

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