In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.

A．the; a

B．a; a

C．the; the

D．a; the

颈内动脉海绵窦瘘治疗的最好方法是（）

A.结扎颈总动脉或颈内动脉

B.开颅结扎颈内动脉

C.开颅海绵窦瘘切开修补术

D.血管内栓塞治疗

E.开颅海绵窦铜丝导入术或马尾导入术