第25题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. His lecture today is about bird’s behavior. B. Prof. Brown will cancel class today. C. He always starts the class at nine. D. He always begins the class ten minutes late. 参考答案:C 答案解析:[听力原文]
M: Oh, my! I am already ten minutes late. Does Prof. Brown always start the class at nine
第33题: [单项选择]抗结核作用最弱的药物是： A. 链霉素 B. 利福平 C. 乙胺丁醇 D. 对氨水杨酸 E. 吡嗪酰胺 参考答案:D 答案解析:[解题思路] 最弱的抗结核药。乙胺丁醇选择性对结核杆菌有较强的抑制作用，对异烟肼或链霉素耐药的结核杆菌也有效，对其他细菌无效；对氨水杨酸抗结核作用弱于异烟肼、利福平、乙胺丁醇和链霉素，但耐药性产生慢，
