He appeared to be an expert in this field of work. _____, he knew nothing about it. [ ]

A. So far

B. As a matter of fact

C. In other words

D. At all

运输经营者从事运输生产活动所创造的剩余价值包括()。

A．税金

B．税金和利润

C．利润

D．运输管理费