单项选择题
Re-handling can save cost and improve service, Is it true or not? （）
A. Wrong B. Not total true C. True D. Not clear here
单项选择题 Where is the rail service better than U.S? （）
单项选择题 If you make different trade in different countries, you must take different transport modes? （）
单项选择题 Pipeline is low cost and reliable. Is it true? （）
