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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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					And faculty members will be wary of any change that threatens the core curriculum in the name of moving students into the workforce. 出自-2012年6月阅读原文
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					College faculty members are afraid that the pretext of moving students into the workforce might pose a threat to the core curriculum 出自-2012年6月阅读原文
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					Google's core business is search and find, so obviously what helps improve Google's search engine is good for Google," he says. 出自-2011年12月阅读原文
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					to promote its core business of searching 出自-2011年12月阅读原文
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					The core objective for universities which are research-led must be to maximise the impact of their research efforts. 出自-2011年12月阅读原文
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					In many of these cities such as Denver, a diverse and vigorous economy attracted to the urban core has offered stable employment for residents. 2017年12月六级真题(第一套)阅读 Section C
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					Joseph calls sharing his knowledge network through peer-to-peer learning a core piece of the company's culture. 2019年12月六级真题(第三套)阅读 Section B
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					Was innovation at the core of the project? 2016年6月六级真题(第一套)听力 Section A
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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