GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 795B8JK25LXC4AABA

According to Dr. Edith Widder, measuring the level of pollutants in sediment provides a more accurate and robust indication of an estuary's health than does measuring the level of chemicals in the water, since pollution in water is (i)____________, but pollution in sediment is (ii)____________. A. declining B. significant C. manageable D. persistent E. transient F. detectable