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题目材料:

Which of the following can be inferred regarding the pulsar discussed in the first paragraph?

  • ATheorists initially doubted its existence

  • BIf its existence had been confirmed, astronomers would and have turned their attention to the pulsar discussed in the second paragraph.
  • CIf the supernovas explosions that created it had been more powerful, the resulting radiation would have preceded the subsequent formation of a planet.
  • DIf it had interacted with a nearby star since the supernova explosion, it would rotate faster than it does.

  • EAstronomers` interest in it ultimately led to a new theory of planetary formation.

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