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题目材料:

The passage is concerned primarily with
  • Apointing out that a particular type of species extinction is rarely known to occur.
  • B proposing a possible explanation for conflicting data about a particular type of species extinction.
  • Cresolving a debate about the frequency of a particular type of species extinction.
  • Dcomparing two theories regarding possible causes of a particular type of species extinction.
  • Erefuting a proposed explanation for the increasingly rare occurrence of a particular type of species extinction.

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