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More than paradise lost, a perishing rain forest could trigger a domino effect - sending winds and rains kilometers off course and loading the skies with even greater levels of greenhouse gases - that will be felt far beyond the Amazon basin.
出自-2013年6月阅读原文
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The bird Clark's nutcracker, for example, hides up to 100, 000 seeds per year, up to 30 kilometers away from the seed source, and has a very close symbiotic(共生的) relationship with several pine species, most 32 notably the whitebark pine.
2016年12月六级真题（第一套）阅读 Section A
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The tiny island nation has set aside 500, 000 square kilometers 80 percent—of its maritime territory, for full protection.
2017年12月六级真题（第二套）阅读 Section A