2013gre考试备考:gre阅读精选题目及答案(一)
想要有效提高GRE阅读水平,就要坚持练习,下面是GRE阅读练习题精选,后附答案。 The energy contained in rock within the earth’s crust represents a nearly unlimited energy source, but until recently commercial retrieval has been limited to underground hot water and/or steam recovery systems. These systems have been developed in areas of recent volcanic activity, where high rates of heat flow cause visible eruption of water in the form of geysers and hot springs. In other areas, however, hot rock also exists near the surface but there is insufficient water present to prod... [ 查看全文 ]2013gre考试备考:gre阅读精选题目及答案(一)的相关文章