— The book isn't easy for Jack to understand, is it?

— ____. His foreign language is far better than expected.[ ]

A. No, it isn't

B. I'm afraid not

C. I don't think so

D. Yes, it is

男性，49岁。右侧胸痛、干咳2周就医。体检：气管居中，右胸叩浊，呼吸音消失。X线胸片示右侧大量胸腔积液。胸水为血性，找到癌细胞，大致为腺癌。

从胸部X线平片上下列哪种征象应考虑到肺癌可能（）

A.胸腔积液量大

B.胸腔大量积液而纵隔无推移，提示同侧有肺不张

C.压迫性肺不张

D.肺门阴影增深

E.侧位片主动脉窗模糊