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gre的机经对我们的备考有很强的参考价值，为了方便大家，下面小编给大家带来GRE阅读高频机经原文：火星的风蚀，来看看吧！
GRE阅读高频机经原文：火星的风蚀
火星的风蚀
One reason researchers have long believed that Mars never enjoyed an extensive period of warm and wet climate is that much of the surface not covered by wind-borne dust appear to be composed of unweathered material. If water flowed for an extended period, researchers reasoned, it should have altered and weathered the volcanic minerals, creating clays or other oxidized, hydrated phases (minerals that incorporate water molecules in their crystal structure).
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