GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 26E65GCP748TROHXA

Although most of the lakes have merged, salinity levels are not ____________ throughout the lake systems: an upward-trending salinity gradient extends southeast from Pelican Lake to East Stump Lake, a distance of nearly 80 kilometers. A. known B. equable C. rising D. problematic E. unprecedented