单选题 (In) warm-blooded animals, their body temperature, regardless of the temperature of the animals' (surroundings), (are) maintained within narrow (limits).
  • A. In
  • B. surroundings
  • C. are
  • D. limits


【正确答案】 C
【答案解析】此题考查主谓一致。这句话的主语是their body temperature，是单数，所以谓语动词are应改为is。