单项选择题 In the seventeenth century, European soldiers who came across some Indian groups in the western Great Lakes found that several native tribes were living in the area without a formal leadership system. They appeared to be 'quite friendly 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 life long familiarity with the tasks of the area. These tasks tended to be simple, since the Indian' s 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 a- rouse others to action by examples. It would be difficult, if not impossible, to carry out such a system in our own society. Most of us have grown up under 6ne authority or another for as we can remember. Our parents, our teachers, our bosses, our government all have the recognized fight 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 society have to perform. often under tight time and resource limitations could not be treated by the Indian system. In modern societies, the formal authority system is necessary to achieve any social objectives.Which of the following sentences is correct according to the passage?A．From 1710 to 1780, European soldiers came across some Indian groups in the western Great Lakes.B．European soldiers were quite friendly to the Indian groups.C．The Indian groups had no leaders.D．The Indian groups only obeyed their own gods.

单项选择题 听力原文：W: Leonard, can I use your library card to borrow a book? I forgot to bring mine.M: I would be glad to be of help. But I am afraid that mine wouldn't be of any use to you anyway. They allow only ten books for one card, and my card is already full.W: Then I have to borrow one from someone else.What do we learn from the man's reply?A．He will not lend his card to anybody.B．The woman cannot borrow books with his card right now.C．Using another person's card is against the rules of the library.D．His library card is no longer valid.

多项选择题 物业管理服务中的主要风险有（）。