单选题
专业英语
2010-11-19
根据下列选项，回答题。
The five primary modes of transportation are rail，road，pipeline，water and air．Each
has different economic and service characteristics． 2 0ffers the cost—effective，energy— efficient transport of large quantities of goods over long distances． 1 0ffers more flexibility and versatility to the shipper than virtually any other forms of transportation． 3 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 Costs．The most expensive of all the modes，4 0ffers the fast service but at a relative high price． 5 0ccurs on inland waterways and oceans．Though slower than other modes，this form of movement is also relatively inexpensive．
请在1处填上正确答案
参考答案
A
答案解析
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