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很多同学都在寻觅GRE阅读的真题资料，其实最权威的整理还是GRE阅读官方指南。具体的GRE阅读真题解析之OG Passage 23-25都有哪些内容呢?下面小编为大家整理具体的内容，供大家参考复习!
GRE阅读真题之OG Passage 23
OG-1
Passage 23
Saturn’s giant moon Titan is the only planetary satellite with a significant atmosphere and the only body in the solar system other than Earth that has a thick atmosphere dominated by molecular nitrogen. For a long time, the big question about Titan’s atmosphere was how it could be so thick, given that Jupiter’s moons Ganymede and Callisto, which are the same size as Titan, have none. The conditions for acquiring and retaining a thick nitrogen atmosphere are now readily understood. The low temperature of the protosaturnian nebula enabled Titan to acquire the moderately volatile compounds methane and ammonia (later converted to nitrogen) in addition to water. The higher temperatures of Jupiter’s moons, which were closer to the Sun, prevented them from acquiring such an atmosphere.
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