—Hey，you haven't been acting like yourself．Everything is OK?

—    .

A．Sure, it is

B．I'm fine，thanks

C．That's good

D．It's a pleasure

物流客户服务表现形式是多样的，可以体现为一种（）。

A.具体活动

B.执行的标准

C.绩效水平

D.态度

E.经营理念