GRE阅读练习每日一篇(五十二)_GRE阅读

　　21. The primary purpose of the passage is to

　　offer a method of calculating the age of circumstellar clouds

　　describe the conditions that result in a star s expiring as a supernova

　　discuss new evidence concerning the composition of planetary nebulas

　　explain why fewer stars than predicted expire as supernovas

　　survey conflicting theories concerning the composition of circumstellar clouds

　　22. The passage implies that at the beginning of the life of IRC+10216, its mass was approximately

　　7.0 M⊙

　　6.0 M⊙

　　5.0 M⊙

　　1.4 M⊙

　　1.0 M⊙

　　23. The view to which line 18 refers serves to

　　reconcile seemingly contradictory facts

　　undermine a previously held theory

　　take into account data previously held to be insignificant

　　resolve a controversy

　　question new methods of gathering data

　　24. 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?

　　The circumstellar cloud surrounding IRC+10216 consists only of CO and NH3 molecules.

　　The circumstellar cloud surrounding IRC+10216 consists of material expelled from that star.

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