2. 外语
  3. Most nations regard their airspace as extending upward as high as an aircraft can fly; no specific altitude, however, has been o

Most nations regard their airspace as extending upward as high as an aircraft can fly; no specific altitude, however, has been o

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问题 Most nations regard their airspace as extending upward as high as an aircraft can fly; no specific altitude, however, has been officially recognized as a boundary.
选项 A、as extending
B、as the extent
C、to be an extent
D、to be an extension
E、to extend
答案A
解析 根据regard…as的用法排除C、D、E。B代入句中，句意理解不通。A合适。注意此处第一个as(划线部分的)是作为“regarded…as”结构的一部分。后面的as high as中的as是同级比较的结构：airspace指“领空”。此处用extending upward表明了领空是一个动态的而非静态的概念。这一判断可由未划线部分的an airplane can fly及no specific altitude has beenofficially recognized as a boundary暗示出来。
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