試題詳解

11. The relative contribution of stress to greving of hair is not known. Hair colour have been determined by cells called melanocytes, which are derived from melanocyte stem cells (MeSCs) located in a part of the hair follicle called the bulge.
(A)greving
(B)known
(C)Hair colour have been determined
(D)called melanocytes
(E)which are derived from