GRE Reading Comprehension: ETS-GRE阅读ETS - MG55HP2ES61ZW6ZJ7

The author mentions "common currency" primarily in order to emphasize the A. lack of differentiation among nerve impulses in human beings B. similarity of the sensations that all human beings experience C. similarities in the views of scientists who have studied the human nervous system D. continuous passage of nerve impulses through the nervous system E. recurrent questioning by scientists of an accepted explanation about the nervous system