2. 外语
  3. The peaks of mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow

The peaks of mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow

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问题 The peaks of 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".
选项 A、crests and troughs that remain stationary although the air that forms them is moving rapidly, are
B、crests and troughs that remain stationary although they are formed by rapidly moving air, are
C、crests and troughs that remain stationary although the air that forms them is moving rapidly, is
D、stationary crests and troughs although the air that forms them is moving rapidly, are
E、stationary crests and troughs although they are formed by rapidly moving air, is
答案C
解析 由主谓一致原则决定A、B、D中are不对，因为主语是单数形式pattern。E、C比较，E有两个缺陷：(1)把原来的限定crests和troughs的that remain stationary变成了stationary crestsand troughs，改变了句意，因为that从句强调在某一状况下，它们是保持静止的；而用后者则表示“静止”这种状况是它们的一种固定的长久性的属性，而由the resulting flow pattern及standingwaves，暗示前者的表达是准确的；(2)这一结构变化还导致了用although状语修饰名词的错误用法。而在C中remain stationary与moving rapidly之间的让步逻辑关系很明确。
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