2. 职称英语
  3. Most nations regard their airspace as extending upward as high as an aircraft ca

Most nations regard their airspace as extending upward as high as an aircraft ca

游客2024-01-13  43
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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