We have chosen what we believe to be the five most spectacular natural wonders--those that are the biggest, longest or most impr

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问题    We have chosen what we believe to be the five most spectacular natural wonders--those that are the biggest, longest or most impressive of their kind. These natural wonders inspire awe (敬畏) in everyone who views them.
   Mt. Everest
   Mt. Everest, whic

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答案277 miles

解析 可以从原文“The canyon is 277 miles long and from 4 to 18 miles wide.”找到答案。
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