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题目材料:

According to the passage, since the early 1990s, sea urchins in the waters east of Cape Hangklip have
  • Asignificantly changed their feed habits
  • Bsuffered increased predation from a certain species
  • Cexperienced increased competition for kelp, their main source of nourishment
  • Dseen a sharp decline in the availability of kelp, due to environmental changes
  • Erebounded as commercial fishing in the region has declined

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