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题目内容
The notion that prehistoric farming of Micronesia`s Mariana Islands degraded the soils upon which savannas now occur is ______ by soil scientists, who attribute nutrient-poor savanna soils instead to long geological periods of tropical weathering.
- Abolstered
- Bproposed
- Ccontradicted
- Delucidated
- Erevived
C显示答案
以上解析由 考满分老师提供。