单选

根据下列材料,请回答下列各题

  • Accordingtothe author, whichof the followingseems governedbythe principle“First come, first served冶?
  • A.Takingbuses.
  • B.Buyinghouses.
  • C.Flyingwithanairline.
  • D.Visitingamusement parks.
参考答案
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