39. Which of the following statements concerning adaptive immunity in mammals is correct?
(A) Cell-mediated immune responses are mediated by T cells.
(B) Humoral immunity is mediated mainly by antibodies and complements.
(C) Helper T cells play important roles in both cell and humoral immunity.
(D) All of the above.

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統計: A(0), B(0), C(0), D(2), E(0) #3222916

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