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题目材料:

According to the passage, astronomers believe which of the following about the "chunks of debris"?
  • AThey may have destroyed a global magnetic field that once existed on Mars.
  • BThey affected Mars more substantially than other planet in the inner solar system.
  • CSome of them contained a higher concentration of metallic particles than did rocks on Mars.
  • DSome of them caused craters that exist in the Terra Sirenum region of Mars.
  • EFew of them were large enough to cause impacts that would beat rocks to 600 degrees Celsius.

D显示答案

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