唾液腺良性肿瘤造影的特征性表现是（）。

A.导管粗细不均，呈腊肠状

B.导管移位，呈抱球状

C.造影剂外溢，呈点状或片状

D.导管变细

E.腺泡充盈缺损

_____ the government's call to develop the west, many college graduates volunteer to work in western part

of China. [ ]

A. Responding to

B. Accustomed to

C. Addicted to

D. Adapting to