I bought the train tickets at the station easily during the spring rush, though ________ of them ________ it.

A．nobody; expected

B．none; had expected

C．nobody; had expected

D．none; expected

患者女，65岁。8周前"感冒"后持续低热，有主动脉瓣狭窄及关闭不全史，首先应考虑下列哪种诊断（）。

A.结缔组织病

B.急性感染性心内膜炎

C.亚急性感染性心内膜炎

D.小叶性肺炎

E.大叶性肺炎