GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 338G7859IE4K38T4A

The juxtaposition of fertile alluvial soils originating in the Andes with the infertile inland soils of central Amazon Basin is one example of ____________ of the soil conditions that can be found in the tropics. A. intractability B. heterogeneity C. incompatibility D. disparateness E. instability F. fragility