38. The word "refinement" as it is used in paragraph 5 most nearly means ___.
(A) reduction
(B) cultivation
(C) refutation
(D) denotation
(E) deterioration
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統計: A(2), B(13), C(4), D(1), E(1) #3094044
統計: A(2), B(13), C(4), D(1), E(1) #3094044