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					Humans cannot, and would die if their legs were exposed for any length of time. 2017年12月六级真题(第三套)阅读 Section C
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					The hills are remnants of an earlier geological era, scraped bare of most soil and exposed to the elements. 2018年6月六级真题(第一套)阅读 Section B
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					The outer layers of the volcano were worn away until the hard core stood completely exposed. 2016年12月六级真题(第二套)听力 Section B
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					Unless renewables become cheap enough that substantial carbon deposits are left underground for a very long time, if not forever, the planet will likely be exposed to potentially catastrophic climate risks. 2017年6月六级真题(第一套)阅读 Section B