Though he is________complete stranger to________country music，he is still addicted to it.[ ]

A．a；the  

B．a；/   

C．the；/  

D．the；the

囊壁内含皮肤附属器的是（）

A.皮样囊肿

B.表皮样囊肿

C.鳃裂囊肿

D.甲状舌管囊肿

E.黏液囊肿