患者，女，46岁，胸闷气短1个月，伴全身乏力、咳嗽、发热。胸片示：中上纵隔增宽，右缘呈波浪状改变。白细胞：8.5×10⁹/L。最可能的诊断是（）

A.胸内甲状腺

B.胸腺瘤

C.右侧中心型肺癌

D.淋巴瘤

E.畸胎瘤

In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.

A.is holding course and speed

B.is turning to starboard

C.intends to pass port to port

D.will keep out of the way of the stand-on vessel