单选

Passage 1

  • A rapid means of long-distance transportation became a necessity for the United States as settlement spread ever farther westward. The early trains were impractical curiosities, and for a long time the railroad companies met with troublesome mechanical pr
  • A.poor quality rails and unreliable stopping systems
  • B.lack of financial support for development
  • C.limited railroad lines
  • D.lack of a transcontinental railroad
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