Only when you stay with ____ local people for a period of time will you have ____ better understanding of life there.

A．a; a

B．the; a

C．the; the

D．a; the

腰麻穿刺进入蛛网膜下隙的部位俗称（）

A.脊髓

B.终池

C.马尾

D.腰膨大

E.脊髓后根