目前用间接免疫荧光法检测抗核抗体，多选用Hep-2细胞作为抗原底物片，其优点主要是()

A．细胞核抗原丰富

B．核大，结构清晰，易于观察结果

C．根据结果的荧光染色模型，可初步判断抗体性质范围和特异性

D．降低结果的阳性率

E．细胞来源稳定可靠，容易标准化

---- You mean the position is still not occupied?

---- Yes, but you must know that our job is very demanding.

---- _______.

A．With pleasure

B．I don’t mind

C．Don’t mention it

D．That’s all right