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.  
【C4】

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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