—By the way, _____________ is it from your home to the Summer Palace?

—It usually takes me 30 minutes to walk there.

A．How long

B．How far

C．How soon

D．How often

产生绩效反差的主要原因是（）

A、员工定位不合理

B、合作障碍

C、互相推诿

D、互相排斥