单选题 This kind of animals is on the verge of dying out.
  • A. drying up
  • B. extinction
  • C. dying off
  • D. distinction


【正确答案】 B
【答案解析】本题是对动词短语的考查。Die out灭绝，灭光；drying up干燥，干涸；extinction灭绝；die off逐渐死亡；distinction差别，不同。