GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - 92YQLSY0O7NVIPLV!

Some scientists speculate that a small pterosaur of the Jurassic period known as Sordes pilosus had ____________ wings that were thin, pliable, and somewhat transparent. A. callous B. arable C. viscid D. membranous E. viscous F. diaphanous