第8题: [单项选择]关于细菌毒力,正确的是 A. 与细菌鞭毛有关 B. 与菌毛无关 C. 内毒素不参与 D. 细菌的毒力基本相同 E. 反映细菌的致病能力 参考答案:E 答案解析:致病菌致病能力的大小称为细菌的毒力,细菌的毒力由侵袭力和毒素(包括内毒素和外毒素)两方面组成。各种细菌的毒力差异很大,菌毛可以帮助细菌黏附在细胞表面。故选E。
第24题: [单项选择]Questions 26 to 28 are based on the passage you have just heard.A. They will become inactive and dull. B. They will not go to cinemas as often. C. They will forget to do their homework. D. They will imitate what they see in the programs. 参考答案:A 答案解析:[解析] What will be the consequence if a child forms a habit of watching hours of television every