[单项选择]Passage Three The men who planned and constructed the first American railroads were men of great vision. They predicted that their “iron horses” would open vast expanses of land to farming and industry. They knew that towns would spring up along the new railroads. Yet few of these pioneers could have guessed that American railroads would establish the system of time used throughout most of the world today. Until the 1880s, all time in the United States was sun time. Farmers set their clocks to noon when the sun appeared to be overhead. In towns, people set their clocks by a courthouse clock or factory whistles. One town’s time was often different from the time in a neighboring town. As the new railroads expanded, large numbers of people began to travel. But the railroads were unable to print accurate timetables when most towns along their tracks have their clocks set differently. There was need for a change, and the railroads led in planning it. In 1883, rai
A. pioneers who rode on “iron horses”
B. large numbers of people who traveled
C. the establishment of standard time
D. the accurate timetable in the United States

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