[求助]OG11-90

taoyeye

90. 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

我觉得E也对啊。为什么不选E？

renprincer

是主动优于被动的问题，和C选项比较的话。另外像remain这种系动词，一般不要在选项中改动，因为它表示一种状态。