中央型肺癌的间接X线征象是（）

A.肺门区肿块

B.支气管狭窄阻塞或中断

C.支气管腔内充盈缺损

D.支气管壁不规则

E.阻塞性肺不张

The _____ fact is that some European countries are heavily in debt, _____China's economy is

generally in good shape. [ ]

A. simple, so

B. bare, nevertheless

C. obvious, because

D. clear, despite