33. Which of the following statement is NOT true?
(A) Early tumors may be recognized and destroyed by natural killer cells and T cells.
(B) Tumor-rejection antigens help the tumor to escape the immune surveillance.
(C) Tumors may avoid immune recognition by expressing inhibitor molecules that repress T cell function.
(D) Transforming growth factor-β, interleukin-10, or indoleamine 2,3-dioxygenase play roles in tumor- induced immune suppression.
答案：99
統計：A:0,B:1,C:0,D:0,E:0
難度：計算中