题目内容：
影响土壤形成的因素有哪些？
A.生物
B.母质
C.气候、地形
D.时间
参考答案：
选择题：影响土壤形成的因素有哪些？
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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（）are most commonly classified as a direct foreign investmen
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