第17题: [单项选择]患者女，50岁。拟行子宫内膜癌根治术。现稍活动即感心慌、气短。既往有27年风湿性心脏病史，曾发生心力衰竭3次。X线胸片、彩色多普勒超声诊断为二尖瓣狭窄并关闭不全，中度肺动脉高压。ECG检查示房颤。 患者的心功能分级是 A. Ⅰ级 B. Ⅱ级 C. Ⅲ级 D. Ⅳ级 E. Ⅴ级 参考答案:C 答案解析:[解析] 目前主要采用美国纽约心脏病学会(NYHA)1928年提出的一项分级方案，主要是根据患者自觉的活动能力划分为四级：Ⅰ级：患者患有心脏病，但活动量不受限制，平时一般活动不引起疲乏、心悸、呼吸困难
第23题: [单项选择]Which of the following statements is true A. That Negroes were docile was denied by the slaveholders. B. That Negroes were docile was not quite true. C. That Negroes were docile was a lie fostered by their masters. D. That Negroes were docile was sheer nonsense. 参考答案:C 答案解析:本题的答案可在文章第3段第5行找到，奴隶主制造这个谎言是为了维护奴隶制。
