题目信息
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".
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
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C:crests and troughs that remain stationary although the air that forms them is moving rapidly, is
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