表示乙型肝炎无症状携带者的指标是（）
A.A
B.B
C.C
D.D
E.E
参考答案：A
— Bob, can you spare me a few minutes right now? I have to ask you some questions.
— ________. [ ]
A. It's a pleasure
B. Ask, please
C. Help yourself
D. Yes, go ahead
不孕
