A.accounted for B.for C.grounds A.Railroads justify rate discrimination against captive shippers on the 【T1】______that B.

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问题 A.accounted for     B.for    C.grounds
A.Railroads justify rate discrimination against captive shippers on the 【T1】______that
B.another railroad is competing【T2】______the business
C.the top four railroads【T3】_______under 70 percent
    In recent years, railroads have been combining with each other, merging into super systems, causing heightened concerns about monopoly.As recently as 1995,【T4】______of the total ton-miles moved by rails.Next year, after a series of mergers is completed, just four railroads will control well over 90 percent of all the freight moved by major rail carriers.
    Supporters of the new super systems argue that these mergers will allow for substantial cost reductions and better coordinated service.Any threat of monopoly, they argue, is removed by fierce competition from trucks.But many shippers complain that for heavy bulk commodities traveling long distances, such as coal, chemicals, and grain, trucking is too costly and the railroads therefore have them by the throat.
    The vast consolidation within the rail industry means that most shippers are served by only one rail company.Railroads typically charge such "captive" shippers 20 to 30 percentmore than they do when【T5】______.Shippers who feel they are being overcharged havethe right to appeal to the federal government’s Surface Transportation Board for rate relief, but the process is expensive, time consuming, and will work only in truly extreme cases.
    【T6】______in the long run it reduces everyone’s cost.If railroads charged all customers the same average rate, they argue, shippers who have the option of switching to trucks or other forms of transportation would do so, leaving remaining customers to shoulder the cost of keeping up the line.It’s theory to which many economists subscribe, but in practice it often leaves railroads in the position of determining which companies will flourish and which will fail."Do we really want railroads to be the arbiters of who wins and who loses in the marketplace?" asks Martin Bercovici, a Washington lawyer who frequently represents shipper.
【T3】

选项

答案accounted for

解析 本题主要考查固定搭配。“account for”为固定搭配,是“占……比例”的意思,符合题意。所以,答案是accounted for。
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