HLA－Ⅱ类抗原主要表达在（）。
A.红细胞
B.B细胞
C.T细胞
D.血小板
E.内皮细胞
参考答案：B
- Oh, these presents are so nice.
- The CD is from Betty and the books are from________.[ ]
A. I and Helen
B. Helen and me
C. Helen's and mine
D. Helen and I
核果
