GRE Text Completion: OG/PP2-GRE填空OG/PP2 - 5ONOIC4F1GZK45TIF

Putting a cash value on the ecological services provided by nature – such as the water filtration "service" provided by a forested watershed – has, historically, been a (i)____________ process. Early attempts at such valuation resulted in impressive but (ii)____________ figures that were seized on by environmental advocates, and then, when these figures were later (iii)____________, they were used by opponents to tar the whole idea. A. dispassionate B. redundant C. ignored D. problematic E. unsound F. discredited G. straightforward H. understated I. confirmed