下列物质属于氧化物的是（　　）

A．空气

B．水

C．红磷

D．铝箔

The contents of the popliteal fossa, EXCEPT （）.

A．tibial nerve

B．common peroneal nerve

C．popliteal vein and its tributaries

D．popliteal artery and its branches

E．deep peroneal nerve