第24题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard.A. To return some business books. B. To apply for a new library card. C. To check out some books from the library. D. To find out where the art books are located. 参考答案:C 答案解析:[解析] 19-22 W: [19]I’m sorry., but I can’t let you check out these books. M: What do you
第35题: [单项选择]有关右心室和肺动脉之间的关系,错误的是()。 A. 右心室借右室流出道与肺动脉相连 B. 肺动脉瓣由3个半月形的瓣叶组成 C. 肺动脉3个瓣叶分为大、中、小三叶 D. 肺动脉3个瓣叶袋口朝上,每个瓣叶游离缘中央有一半月小结 E. 右室流出道为一光滑的肌性管状结构 参考答案:C 答案解析:肺动脉瓣有三个半月形瓣膜,瓣叶分为左瓣、右瓣和前瓣。