73. These cells are involved in innate immunity, and a person lacking these cells may have a higher than normal chance of developing malignant tumors:
(A) cytotoxic T cells
(B) natural killer cells
(C) helper T cells
(D) macrophages
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統計: A(0), B(0), C(1), D(0), E(0) #3389898
統計: A(0), B(0), C(1), D(0), E(0) #3389898