The five primary modes of transportation are rail,road,pipeline,water,and air. Each has different economic and service characte

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问题 The five primary modes of transportation are rail,road,pipeline,water,and air.  Each has different economic and service characteristics.【B1】offers the cost—efiective,energy—efficient transport of large quantities of goods over long distances.【B2】offers more flexibility and versatility to the shipper than virtually any other forms of transportation.【B3】are primarily used to move petroleum,natural gas,and chemicals.For suitable commodities,pipelines are the most efficient mode of transport.They offer a closed system with little risk of loss or damage to the products moved and extremely low cost.The most expensive of all the modes,【B4】offers the fast service but at a relative high price.【B5】 occurs on inland waterways and oceans.Though slower than other modes,this form of movement is also relativelv inexpensive.
【B4】

选项 A、air transport
B、CY/CY
C、sea train
D、rail transport

答案A

解析 航空运输的运输速度最快,安全性也较高,但运输费用高,主要用于运输一些贵重的、时效性要求高的货物。
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