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题目材料:

It can be inferred from the passage that the author assumes which of the following in the discussion of the rate at which IRC+10216 loses mass?
  • AThe circumstellar cloud surrounding IRC+10216 consists only of CO and NH3 molecules.
  • BThe circumstellar cloud surrounding IRC+10216 consists of material expelled from that star.
  • CThe age of a star is equal to that of its circumstellar cloud.
  • DThe rate at which IRC+10216 loses mass varies significantly from year to year.
  • EStars with a mass greater than 6 M⊙ lose mass at a rate faster than stars with a mass less than 6 M⊙ do.

B显示答案

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