【OG真题passage23】!导致GRE阅读丢分基本有几个原因：文章篇幅太长不会定位、题目出现复杂数字干扰思路、细节题解题效率太低等，要解决这些问题，同学们要多练习和总结做题思路，提高做题效率。
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.
1. 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
| Passage | 第一题 | 第二题 | 第三题 | 第四题 |
| 1 | E | AC | “His … classics.” | |
| 2 | B | |||
| 3 | “From … conductor.” | C | E | |
| 4 | B | D | ||
| 5 | B | D | ||
| 6 | AC | B | ||
| 7 | B | |||
| 8 | D | E | ||
| 9 | C | A | A | E |
| 10 | E | |||
| 11 | A | |||
| 12 | BC | ABC | ||
| 13 | D | B | B | B |
| 14 | AB | “Of … idea.” | B | |
| 15 | D | |||
| 16 | C | B | “Thomas … high.” | B |
| 17 | A | |||
| 18 | C | C | A | |
| 19 | ABC | A | ||
| 20 | E | |||
| 21 | ABC | “In … Voltaire.” | ||
| 22 | C | D | E | |
| 23 | B | |||
| 24 | C | |||
| 25 | A | “When … movement.” | A |
