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题目材料:

The "carbonaceous meteorites" are important to the first of two alternative possibilities discussed in the passage because these meteorites.
  • Aappear to account for an issue left unresolved by the comet-based theory
  • Bshow a wider range of D/H values than do other known meteorites
  • Cshed light on how D/H value of Earth's water might have changed over time
  • Dsupport a recently developed theory about the composition of the asteroid belt
  • Eare representative of the bodies that were once present in the asteroid belt

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