第13题: [单项选择]引起肾盂肾炎的最常见的致病菌是() A. 链球菌 B. 葡萄球菌 C. 变形杆菌 D. 大肠杆菌 E. 绿脓杆菌 参考答案:D
第14题: [单项选择]Questions 26 to 28 are based on the passage you have just heard.A. Watch traffic. B. Obey commands. C. Cross streets safely. D. Guard the door. 参考答案:D 答案解析:[解析] Which of the following is not a necessary skill guide dogs have to learn