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  • The passage implies that if a star contains calcium, then the . . .
    According to the big bang theory of the origin of the universe, the first gas clouds-and the first generation of stars formed from them-were composed of pure hydrogen and helium: most heavier elements - iron and calcium, for example-came later, created by explosions of supernovas, massive stars in their death throes 中的for example-came later可知选A
  • Some paleontologists debate whether the diversity of . . .
    Some paleontologists debate whether the diversity of species has_____ since the Cambrian period, or whether imperfections in the fossil record only suggest greater diversity today, while in actuality there has been either_____ or decreased diversity
  • The passage contains information about each of the . . .
    Like paleontologists who interpret timescales from fossil Evidence, we infer the history of star formation in the Milky Way galaxy from the heavy-element composition of its stars
  • The author of the passage is primarily concerned with答案 . . .
    In the early 1980`s, scientists began to look closely at the question of how these extinctions occur Two paleontologists, Raup and Sepkoski, compiled amaster list of marine species that died out duringthe past 268 million years and noted that there were brief
  • The author of the passage would most likely describe the . . .
    【雷哥GRE题库】阅读 逻辑1998试题及答案解析The author of the passage would most likely describe the findings of Roup and Sepkoski as The origin of the theory that major geologic events may occur at regular intervals can be traced back not to a study of volcanism or plate tectonics but to an investigation of marine extinctions
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    【雷哥网GRE在线做题】提供GRE单项练习，GRE考点练习和GRE难度练习，为考试整理汇总GRE历年真题，包含冲分救命题、真题机经、og、magoosh、xdf真题、NO 题和kaplan等一系列真题练习，让考生轻松刷题备考GRE。





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