【题目】【1】黄土高原土质疏松，历史上由于植被破坏，加上降水变率大，导致水土流失，形成千沟万壑的地表景观。这体现了黄土高原地理环境的
A．差异性 B．整体性 C．稳定性 D．周期性
【2】生物在成土过程中的作用表现在
A．提供土壤矿物质
B．保证土壤蓄水保温
C．减少养分元素
D．积累有机物，形成土壤肥力
【3】陡峭的山坡上难以发育成深厚的土壤的原因是
A．地表疏松物质的迁移速度快
B．地表疏松物质的侵蚀速率较慢
C．光热条件太差
D．水分条件太差
【答案】
【1】B
【2】D
【3】A
【解析】
试题分析：
【1】一个因素的变化导致其他因素甚至整个环境的变化，属于自然地理环境整体性的表现。黄土高原由于植被破坏，导致水土流失，体现了地理环境的整体性。
【2】生物是土壤发生发展中最活跃的成土因素,由于它的创新作用,才使得拇指产生肥力而转变为土壤.再一定意义上讲,土壤的形成过程就是在一定条件下,生物不断改造母质而产生肥力的过程,没有生物的参与和作用,就没有成图过程.正是由于生物群体的作用,才能把太阳辐射能引进成土过程,才能把分散于岩石圈、水圈和大气圈的营养元素向岩石风化壳（母质）的表层聚积,形成以肥力为本质特征的土壤,并推动土壤的发展演化.
【3】本题考查土壤的形成条件。陡峭的山坡受重力影响，水流速度比较快，侵蚀作用强，地表疏松物质的迁移速度快。所以本题选择A选项。地表疏松物质的侵蚀速率较慢B错误；光热条件没有关系，C错误；水分条件太差不是主要因素，D错误。
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