GRE Text Completion: JiJing 1373-GRE填空机经1373题 - RB7MP22O837DTN7VA

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. A. bolstered B. proposed C. contradicted D. elucidated E. revived