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题目材料:

The primary purpose of the passage is to
  • Apresent several hypotheses concerning the cause of the Permian mass extinctions
  • Bdiscuss the strengths and weaknesses of the asteroid hypothesis of the Permian mass extinctions
  • Cpropose that theories regarding the cause of the Permian mass extinctions be tested
  • Dargue that Permian mass extinctions could not have been caused by a volcanic explosion
  • Edescribe one reason that a rise in hydrogen sulfide would cause massive marine extinctions

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