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Passage 1 hydrogeology is a science dealing with the properties, distribution, and circulation of water on the surface of the land, in the soil and under- lying rocks, and in the atmosphere.水文地质学是一种科学，处理水的特质 分布和循环的的科学， 这些水一般在地表 地下岩石土壤中和大气中。The hydrologic cycle, a major topic in this science, is the complete cycle of phenomena through which water passes, beginning as atmospheric water vapor, passing into liquid and solid form as pre- cipitation, thence along and into the ground (10) surface, and finally again returning to the form of atmospheric water vapor by means of evap- oration and transpiration.水文地质学循环，作为主要的科学主题，是一种完整的循环现象，通过这种现象，水压——开始是大气中的水蒸气，然后形成液态和固态，成为了降雨，由此延续进入地表，最终再一次回到水蒸气的形式，通过脱水与蒸发的方式。 注：GRE考试中，这样的句子都是明显的语法错误——through which后面应该引导从句，但是本句中through which后面根本没有谓语，所以考试的时候，这样的句子只能直着翻译，能深究其语法问题。 The term geohydrology is sometimes erroneously used as a synonym for hydro- (15) geology. Geohydrology is concerned with underground water. 而术语“地质水文学”有时被错误地当成是“水文地质学”的同义词。There are many formations that contain water but are not part of the hydro- logic cycle because of geologic changes that have isolated them underground. 有许多自然结构包含水分，但是它们却能算作水文循环，这是因为地质变动将它们隔离到了底下中去。These systems are (20) properly termed geohydrologic but not hydro- geologic. 这些系统（指上句话的“自然结构”）被恰如其分地命名为“地质水文学”，但是却是水位地质学。 Only when a system possesses natural or artificial boundaries that associate the water within it with the hydrologic cycle may the entire system properly be termed hydrogeologic. 只有当这一系统结构拥有自然或者人工界限的时候——这种界限将这种系统结构的水与其水循环结合在一起——这种系统结构才是一个完整的系统，才能被命名为水文地质学。 17. The authors primary purpose is most probably to 作者的主要目的最有可能是 (A) present a hypothesis提出假设 (B) refute an argument驳斥观点 (C) correct a misconception纠正误解 (D) predict an occurrence预测事件 (E) describe an enigma叙述谜团 18. It can be inferred that which of the following is most likely to be the subject of study by a geohydrologist? 从以下选项当中推出哪一个是最有可能成为地质水文学家所研究的对象？ (A) Soft, porous rock being worn away by a Waterfall由于瀑布冲刷而产生