颅底内面有颅前、中、后三个窝，当颅底骨折，鼻腔有液体流出时，推测是损伤了三窝中哪一部位的哪一结构（）

A.颅前窝内的眶板

B.颅中窝内的鼓室盖

C.颅中窝内的颈动脉管

D.颅后窝内的颈静脉孔

E.颅后窝内的内耳门

Whih of the following statements regarding the cerebrospinal fluid is FALSE

A．It is secreted by the choroids plexus

B．It bathes and nourishes the brain and spinal cord

C．It is composed mostly of protein with little sodium and potassium

D．It is resorbed by arachnoid villi

E．Blockage of its pathway leads to hydrocephalus