单选题 When he arrived in America, he was surprised to learn that the mayor of the city was Chinese by ______.
  • A. nature
  • B. resource
  • C. origin
  • D. source
【正确答案】 C
【答案解析】[解析] origin起源，来源 by nature天生，就其本性而言 resource资源 source源[泉]，发源地；来源，出处