—The artist has got _____ much work to do that he hardly has  time to help his wife with the

housework.        

—That’s true. Even on Sundays he is busy with his work.[ ]

A. too    

B. so    

C. very    

D. such

以下物流活动中不存在约束关系的是( )。

A．运输与库存

B．客户服务水平与物流成本

C．生产物流与销售物流

D．提高供货率与增加库存