GRE Text Completion: JiJing 1373-GRE填空机经1373题 - K084EECRW20LZ2U7A

It may not seem like a big deal for produce distributors to mix together soybeans from different farms, but a growing number of buyers are willing to pay a premium for soybeans the ____________ of which is know: they like to know exactly where their food came from. A. purity B. output C. heterogeneity D. origin E. yield F. provenance