unit 5 单词

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Across
  1. 3. a natural desire to eat
  2. 6. to increase greatly in number
  3. 12. the act of leaving a place
  4. 13. a state of complete disorder
  5. 14. in a sudden and noticeable way
  6. 15. an animal that lives in a particular place
  7. 17. a device used for catching animals
  8. 18. to increase suddenly and rapidly
  9. 20. the gradual destruction of soil or rock by wind or water
  10. 21. a rodent that often lives near humans
Down
  1. 1. located at an equal distance between two points
  2. 2. after something else has happened
  3. 4. the protection of nature and natural resources
  4. 5. to become smaller or fewer
  5. 7. plants in general
  6. 8. to fall down suddenly
  7. 9. the natural home of a plant or animal
  8. 10. a tiny organism that causes disease
  9. 11. a small parrot with a long tail
  10. 16. the body’s ability to resist infection
  11. 19. a black and white seabird that lives in cold regions