托运批量大小可分为整车运输、（）、集装箱运输和包车运输。
A．分散运输
B．零担运输
C．单边运输
D．短途运输
参考答案：B
Unfortunately, when I dropped in, Dr. Green ______, so we only had time for a few words.
A．just left
B．has just left
C．had just left
D．was just leaving
高效率方框图
