--- Mr. Jason, could you help me carry my bag to the third floor? It’s too heavy for me.

--- _______________.

A．My pleasure

B．It’s a pleasure.

C．With pleasure.

D．You are welcome.

诊断系统性红斑狼疮最有意义的检查是

A．免疫球蛋白测定

B．抗核抗体

C．总补体溶血活力测定

D．E玫瑰花环试验

E．淋巴细胞转化试验