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题目材料:

The author of the passage mentions "most astronomers" primarily in order to
  • Ahighlight the research conducted on quasars during the twenty years after their discovery
  • Bsuggest that quasars were a popular subject of scientific inquiry in the 1960s
  • Cemphasize the importance of empirical observations for evaluating astronomical theories
  • Dindicate that a particular theory about quasars was widely thought to be improbable
  • Ediscuss an effort that eventually led to the discovery of massive black holes

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