(c) the interstate highway system

　　(d) american society

　　3 which of the following can be inferred from the passage?

　　(a) the united states regarded great britain as a competitor in developing the most efficient railroad system

　　(b) steam locomotive power was first used in 1832

　　(c) american businessmen saw railroads as a threat to established businesses

　　(d) steam locomotives replaced horses because of the distances across the country the author concludes that for the first decade or more， there was not yet a true railroad system because

　　(a) passenger cars were not stable， comfortable or large

　　(b) locomotives were not powerful enough

　　(c) schedules were unreliable and wrecks were frequent

　　(d) lines were relatively short and not usually linked

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