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编辑点评： 新版GRE考试的考生都觉得语文部分的题难了，这主要是由于新GRE逻辑阅读部分的内容考生还是有点不习惯，或是没有准备充足。本文为大家整理一些新GRE逻辑阅读的练习题，希望考生能从平日的练习中总结规律，找到解题技巧。 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 in addition to water. The higher temperatures of Jupiter s moons, which were closer to the Sun, prevented them from acquiring such an atmosphere. According to the passage, Titan differs atmospherically from Ganymede and Callisto because of a difference in A rate of heat loss B proximity to the Sun C availability of methane and ammonia D distance from its planet E size Description | 
