题目

下列关于统计菌落数目的方法的叙述，不正确的是（ ）                            A．采用平板计数法获得的菌落数往往少于实际的活菌数                                 B．当样品的稀释度足够高时，一个活菌会形成一个菌落                                 C．为了保证结果准确，一般采用密度较大的平板进行计数                             D．在某一浓度下涂布三个平板，若三个平板听下面一段对话，回答1-3三个小题。 1. What happened to Peter? [     ]A. He was late for school.B. He had no breakfast to eat. C. He lost his keys. 2. When did Peter go to the woman's place? [     ]A. At nearly 7:40. B. At nearly 8:10. C. Before 8:00. 3. How did Peter come to school today? [     ]A. By taxi. B. By bike. C. On foot.