GRE Text Completion: Maggoosh-GRE填空Maggoosh - STOLH9435WS547O9Y

Though many are apt to believe that the bones from a recent discovery are those of a direct ancestor of modern humans, some scientists are skeptical, and contend that the remains, while suggesting a common ancestor, are but a vestige of one of evolution's many ____________ experiments. A. noble B. unviable C. intuitive D. unsuccessful E. archaic F. ingenious