单项选择题 A．to B．for C．with D．on

未知题型 8月，草鱼在水表层打转或狂游，尾鳍上叶常露出水面，鳃苍白无血色，鳃丝末端膨大成棒槌状。肉眼可见鳃丝末端内侧有乳白色虫体。该病最可能的诊断是（）

单项选择题 A Society Without a Formal Authority In the seventeenth century, European soldiers who came across soreS'Indian groups in the western Great Lakes round that several native tdbes （部落） were living in the area without a formal leadership system. They appeared to be 'quite fridendly with each other without a formal authority'Not only did the Indians appear to lack a formal system.of authority, but they also deeply hated any efforts to control their actions. All members of the tribes knew what was required of them by lifelong （一生的） familiarity with the tasks of the area. These tasks tended to be simple, since the indians' rate of social change was slow. Thus, although subgroups such as soldiers had recognized leaders, no real authority was required.Rather than giving direct orders （which were considered rough）, members of the tribes would arouse others to action by examples.It would be difficult, if not impossible, to carry out such asystem in our own society.Most of us have grown up under one authority or another for as long as we can remember. Our parents, our teachers, our bosses, our government all have the recognized right under certain conditions to tell us what to do. The authority is so much a part of our culture that it is hard for us to imagine a workable society without it. We have been used to relying on authority to get things done and would probably be uncomfortable with the Indian methods of examples on a large scale.Of course, the major reason why the Indian system would not be suitable for us is that our society is too large. The number of tasks that various members of our scciety have to perform. often under tight time and resource limitations could not be treaed by the indian system. In modern societies, the formal authority system is necessary to achieve any social objectives.第 28 题 Which of the following statements about the European soldiers is correct?A．They had no leaders.B．They treated the Indian groups well.C．They came across some Indian groups.D．They found the Indian groups friendly to them.