下列哪项不是环状软骨的结构（）。

A.后面有较小的开口

B.前部较窄称环状软骨弓

C.环状软骨板上有环杓关节面

D.环状软骨板下部两侧是环甲关节面

E.环状软骨下缘平整近水平

I think swimming is _____ hiking.[ ]

A. as interesting than

B. as more interesting as

C. as interesting as

D. more interesting as