There are some dangerous fishes in this river, and I've warned Jack _____

here.    [ ]

A. not to swim    

B. to not swim   

C. swim not to    

D. to swim not

刘某，女，18岁，尿毒症，肾功能衰竭，超声发现颈前部甲状腺周围有多个低回声结节，最可能是：（）

A.颈淋巴结肿大

B.甲状腺腺瘤

C.结节性甲状腺肿

D.甲状旁腺增生

E.甲状旁腺腺瘤