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

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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.【C1】________offers the cost-effective, energy-efficient transport of large quantities of goods over long distances. 【C2】________ offers more flexibility and versatility to the shipper than Virtually any other forms of transportation. 【C3】________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, 【C4】________offers the fast service but at a relative high price. 【C5】________occurs on inland waterways and oceans. Though slower than other modes, this form of movement is also relatively inexpensive.  
【C3】

选项 A、Air transport
B、Rail transport
C、Pipelines
D、Multimodal transport

答案C

解析 管道运输是一种最为特殊的运输方式,主要用于运输液体或气体类货物,包括石油、天然气等。
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