28. The function of a mature B cell is to
(A) make antibodies against several different antigens
(B) make antibodies against only a single antigen
(C) leave the lymph node to search out and destroy invaders
(D) differentiate into a killer T cell
(E) differentiate into a macrophage

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統計： A(15), B(37), C(3), D(2), E(5) #2238501