题目

John Green is our English teacher. We often call him ________. A . Mr. Green B . Miss Green C . Ms. Green D . Mrs. Green 答案：A现从A，B向甲、乙两地运送蔬菜，A，B两个蔬菜市场各有蔬菜l4吨，其中甲地需要蔬菜15吨，乙地需要蔬菜l3吨，从A到甲地运费50元/吨，到乙地30元/吨；从B地到甲运费60元/吨，到乙地45元/吨．怎样调运蔬菜才能使运费最少？最少的总费用是多少？