段2：①Supporters of the new supersystems argue that these mergers will allow for substantial cost reductions and better coordinated service. ②Any threat of monopoly, they argue, is removed by fierce competition from trucks. ③But 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.
51. According to those who support mergers, railway monopoly is unlikely because
[A] cost reduction is based on competition.
[B] services call for cross-trade coordination.
[C] outside competitors will continue to exist.
[D] shippers will have the railway by the throat.
答案：C
问：51题题干中的those who support mergers对应到原文中，是对如下哪项的同义改写？
A : Supporters of the new supersystems
B : many shippers
C : major rail carriers
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