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题目材料:

The Alvarezes concluded that a meteorite was responsible for a mass extinction because
  • Adinosaurs were prone to the effects of iridium
  • Bit could account for the heightened presence of an element
  • Ccosmic dust in the form of iridium constantly makes its way to the Earth`s surface
  • Dthe scaglia rossa had a sudden gap in traceable iridium
  • Ethe scientific community was unable to provide a more valid hypothesis

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