A: Did you see ___________ dog just now?

B: Is it ___________ black dog?

A: Yes. It is.

B: Oh, I just saw it passing the door. [ ]

A: the; a

B. a; a

C. the; 不填

最易向右锁骨上淋巴结转移的肿瘤是（）

A.乳腺癌

B.支气管肺癌

C.胃癌

D.肝癌

E.直肠癌