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When the molten rock of the earth’s core forced its way to the surface to form the throat of a volcano, as the centuries passed, the rock cooled and hardened, shrinkingand cracking into long columns.
出自-2016年12月听力原文
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The outer layers of the volcano were worn away until the hard core stood completely exposed.
出自-2016年12月听力原文
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When the molten rock of the earth's core forced its way to the surface to form the throat of a volcano, as the centuries passed, the rock cooled and hardened, shrinking and cracking into long columns.
2016年12月六级真题（第二套）听力 Section B