单项选择题
Where is the rail service better than U.S? （）
A.Canada B.Europe C.Japan D.Nowhere
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? （）
单项选择题 Cost of pipeline is very different of underground conditions. Is it right? （）
