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题目材料:

It can be inferred from the passage that the "attempts" share which of the following goals?
  • A to explain how a Jupiter-sized planet could form so close to its parent star.
  • Bto explain what prevents a hot Jupiter from colliding with its parent star.
  • C to determine whether a hot Jupiter is formed from a protoplanetary disk of dust and gas.
  • Dto determine whether a hot Jupiter`s gravitational field is strong enough to create a groove in its protoplantary disk
  • Eto account for hot Jupiters in a way that is not inconsistent with the standard theory of planetary formation.

E显示答案

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