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Alex7277 Alex7277
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6 years ago
The United States changed to standard time zones when
 
  a. Congress passed a law establishing this system.
  b. the major rail lines decreed common fixed times so that they could keep schedules and avoid wrecks.
  c. factories demanded standard time schedules.
  d. long-distance telephones required standard time coordination.
  e. All of these choices are correct.
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6 years ago
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