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编辑点评： GRE阅读的复习和作文的复习往往可以相辅相成，这里为大家精选了一些阅读中的句子，大家可以选择性地用在作文中作为一个例证。也可以参考句子的结构自己学着写一下结构较为复杂的句子。 23.The hydrologic cycle，a major topic in this science，is thecomplete cycle of phenomena through which water passes，beginning asatmospheric water vapor，passing into liquid and solid form asprecipitation，thence along and into the ground surface，and finallyagain returning to the form of atmospheric water vapor by means ofevaporation and transpiration. 水文循环，作为该学科中的一个主要课题，指的是水所经过的诸现象的整个循环过程，开始时是作为大气中的水蒸气，转而作为雨、雪、露、雹一类的降水量经过液体和固体形态，由此而沿着地层表面分布或进入地层表面，最终通过蒸发和散发作用再度回复到大气水蒸气的形态。 24.The historian Frederick J. Turner wrote in the 1890 s that theagrarian discontent that had been developing steadily in the UnitedStates since about 1870 had been precipitated by the closing of theinternal frontier that is，the depletion of available new land neededfor further expansion of the American farming system. 史学家弗雷德里克.杰.特纳于十九世纪九十年代著述道，美国约自18世纪70年代以来一直在持续不断发展的农民不满，由于国内边远地区的封闭而更趋加剧 亦即是说，美国农业系统进一步扩展所必需的可资利用的新土地几近耗竭。 | 
