GRE阅读练习每日一篇(五十二)
Apparently, stars that have a mass of greater than 6 M⊙ are somewhat rare.
Recent studies of CO and NH3 in the circumstellar clouds of stars similar to IRC+10216 have led astronomers to believe that the formation of planetary nebulas precedes the development of supernovas.
It appears, then, that IRC+10216 actually represents an intermediate step in the evolution of a giant star into a planetary nebula.
Astronomers have yet to develop a consistently accurate method for measuring the rate at which a star exhausts its nuclear fuel.
27. Which of the following titles best summarizes the content of the passage?
New Methods of Calculating the Age of Circumstellar Clouds
New Evidence Concerning the Composition of Planetary Nebulas
Protoplanetary Nebula: A Rarely Observed Phenomenon
Planetary Nebulas: An Enigma to Astronomers
The Diminution of a Star s Mass: A Crucial Factor in Stellar Evolution
答案：17-27：CDEADBABADE
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