有关解剖无效腔的描述正确的是（）

A.死腔气约为150ml

B.解剖无效腔又称死腔气

C.死腔气不参与气体交换，仅在呼吸细支气管以上气道中起传导作用

D.死腔气约与潮气容积相等为500ml

E.死腔气参与气体交换

(2013·山西高三诊断)Chengdu has focused on improving the surrounding countryside, ________ encouraging large­scale city expansion.

A．due to

B．rather than

C．except for

D．other than