— I don't have any change with me.Will you pay the fare for me? 

— _______.  [ ]

A. That's all right.

B. I don't believe you.

C. How dare you say that?

D. Sorry, but that's no excuse.

关于“质控品”叙述不正确的是（）

A．含量确定的处于一定基质中的特性明确的物质

B．含量已知、处于与实际标本相同基质中特性明确的物质

C．质控品不一定是纯品

D．质控品一般分高、中、低三种

E．质控品必须具备良好稳定性