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 troughts that remain stationary although the air that forms them ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ is moving rapidly, are known as "standing waves". ^^^^^^^^^^^^^^^^^^^^^^^ (A)crests and troughts that remain stationary although the air that forms them is moving rapidly, are (B)crests and troughts that remain stationary although they are formed by rapidly moving air, are (C)crests and troughts that remain stationary although the air that forms them is moving rapidly, is (D)stationary crests and troughts although the air that forms them is moving rapidly, are (E)atationary crests and troughts although they are formed by rapidly moving air, is 各位大大 再下用主词动词一致原则删掉了(A)(B)(D) 但是不知道(E)错在哪里 OG11对(E)的解释"the clause following although is awkward and unclear"是什麽意 思? OG10对(E)的解释(205题)"it incorrectly introduces a dependent adverbial although clause into a prepositional phrase(with crests...)"也不是很了解它的意 思。 希望大家能提供一些意见，谢谢大家! --

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