GRE阅读非常看重对逻辑的理解。很多人以为的“理解逻辑”只是辨识出两个信息是什么关系，比如对比，比如支持，比如让步……
但其实“理解逻辑”绝不只是看出来这是什么逻辑，必须要明白这个逻辑为什么可以在这里存在，是什么信息使得这个逻辑能够成立。
比如：万蜀黍很优秀，但他是河南人。
比如：万蜀黍很优秀，所以他肯定家境贫寒。
当文章对两种特点进行对立，或者对两方观点进行对立，我们最关键的阅读意识就是要始终要求自己读出两方差异在哪里。
例题-1
Most seismologists assume that following a major earthquake and its aftershocks, the fault (a break in Earth’s crust where pressure can trigger an earthquake) will remain quiet until stresses have time to rebuild, typically over hundreds or thousands of years. Recent evidence of subtle interactions between earthquakes may overturn this assumption, however. According to the stress-triggering hypothesis, faults are unexpectedly responsive to subtle stresses they acquire as neighboring faults shift. Rather than simply dissipating, stress relieved during an earthquake travels along the fault, concentrating in sites nearby; even the smallest additional stresses may then trigger another quake along the fault or on a nearby fault. Although scientists have long viewed such subtle interactions as nonexistent, the hypothesis has explained the location and frequency of earthquakes following several destructive quakes in California, Japan, and Turkey.
答案
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解题思路：
例题-2
New underwater tunnel projects increasingly rely upon immersed tube technology, which involves digging a channel in the seabed and then sinking prefabricated tunnel sections into it. As well as being more resilient in earthquakes, immersed tubes are generally faster and less expensive to build than traditional bored tunnels. To begin with, problems with one section of tunnel won’t necessarily delay the entire project, and because immersed tubes can have a rectangular cross-section, they are a more efficient shape than circular tunnels for side-by-side railway lines. And while bored tunnels are usually considered stable only if their depth under the seabed at least equals their diameter, immersed tubes can sit immediately under the seafloor, allowing shallower approach gradients.
答案
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解题思路：
关键是要明白，第一句话说了现在的tunnel用的叫immersed tube技术，而第二句说这种技术取代了先前的bored tunnels，这个时候对立已经出现。而下一句的关键逻辑提示to begin with以及再下一句开头的and表明，接下来两句话都是要展开这个对立。
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