11、二尖瓣狭窄最常见的原因是

A、风湿性心内膜炎                                             B、急性细菌性心内膜炎

C、动脉粥样硬化                                                 D、亚急性细菌性心内膜炎

12、风湿性病变的最特征性病变是

A、纤维素样坏死                                                 B、炎细胞浸润

C、心瓣膜赘生物                                                 D、Aschoff小体

13、缓进型高血压病第一期的病理改变是

A、细小动脉痉挛                                                 B、细小动脉硬化

C、左心室肥大                                                    D、大中动脉粥样硬化

14、亚急性细菌性心内膜炎的病变特点是

A、瓣膜增厚、粘连                                             B、瓣膜炎症伴赘生物形成

C、瓣膜大面积坏死、穿孔                                   D、心内膜附壁血栓形成

15、鼻咽部梭形细胞癌属于

A、腺癌                                                               B、鳞状细胞癌

C、未分化癌                                                        D、小细胞癌