gre阅读是许多考生难以攻克的大山，下面先来看看GRE阅读高频机经原文30：Supernovae&Obscurat by dust，一起来学习吧！
GRE阅读高频机经原文30：Supernovae&Obscurat by dust
Supernovae & Obscuration by dust
Recently, significant progress has been made by using Type Ia supernovae as ``standardizable candles''. Supernovae are rare - perhaps a few per century in a Milky-Way-sized gala
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