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题目内容
The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves".
  • Acrests and troughs that remain stationary although the air that forms them is moving rapidly, are 分析该选项
  • Bcrests and troughs that remain stationary although they are formed by rapidly moving air, are 分析该选项
  • Ccrests and troughs that remain stationary although the air that forms them is moving rapidly, is 分析该选项
  • Dstationary crests and troughs although the air that forms them is moving rapidly, are 分析该选项
  • Estationary crests and troughs although they are formed by rapidly moving air, is 分析该选项
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正确答案: C
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题目基本信息

  • 所属科目:语法SC
  • 题目来源1:OG12-95
  • 正确率:66%
  • 难度:

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