—Don't be angry with your kid when he makes a mistake again, will you?

—No, I won 't.  I know  that     of us  are perfect after all.

A．none

B．neither

C．each

D．all

逆向物流的作用可以体现在（）。

A.提高顾客价值，增加竞争的优势

B.降低物料成本，增加企业效益

C.改善环境行为，塑造企业形象

D.改造生产更加容易

E.与正向物流相辅相成