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Conversation 2[听力原文]9-10W: What’s going on hereM: You mean, what’s happening Well, constable, I’m trying to get out of the window and Freud here is helping me.W: Why are you climbing through the window and not leaving by the front doorM: Well. you see I can’t find the key and I’m in a hurry. Come on, Freud, we’re wasting time.W: Just a minute you two. I don’t think you’re telling me the truth. This isn’t your house, is itM: No. it’s my brother’s. I’m staying with him for a while.W: Is he at homeM: I’m afraid not. He’s just in jail for house-breaking at the moment what was the man doing（）
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(四) [背景资料] 某工程位于某市中立交桥与体育场路口交叉处，总建筑面积4万多平方米，其中一号楼、二号楼和三号楼均为高层建筑。该屋面上有各种管道和屋顶花园设施等，针对该工程的使用功能和对防水、隔热要求高、难度大的特点，建设单位设计部门对防水保温隔热方案的设计和施工十分重视，经过实地考察并分析具体情况，通过精心施工，克服了各种困难，于1998年12月22日一起与其他项目验收为省优良工程，得到各方面的好评。 请简述上一问中所提到的制度的主要任务。
设二叉树根结点的层次为O，对含有100个结点的二叉树，可能的最大树深度和最小树深度分别是______。
阅读以下说明，回答问题1-4。[说明] 设学校教学数据库的模式如下： S(SNUM，SNAME，AGE) SC(SNUM，CNUM，CREDIT，SCORE) C(CNUM，CNAME，TEACHER) T(TNUM，TEHCHER，POS，SAL) SNUM表示学生的学号，SNAME表示学生的姓名，AGE表示学生的年龄，CNUM表示选修课程的编号，CREDIT表示该课程的学分，SCORE表示课程的成绩，CNAME表示课程名，TEACHER表示任课的教师,TNUM表示老师的工作证号，POS表示教师的职称，SM，表示教师的收入。 试定义下列完整性约束和规则： [问题1] 在关系S中插入的学生年龄值应在18～21岁之间。
Some people believe that you have to be a special kind of person to sell a product. But although it is clear that a successful salesman does need special talents and an open personality, many of the skills be uses are used by us all.We build and keep relationships with different kinds of people, we listen to and take note of what they tell us and don’t just enjoy the sound of our own voices, and we explain things to them or discuss ideas with them.In the same way, any company needs to establish a personal relationship with its major clients and potential customers. It is often said that "people do business with people": a firm doesn’t just deal impersonally (没有人情味地) with another firm. A person in the buying department regularly receives personal visits from people representing the firm’s suppliers (供应商)—or in the case of department stores or chain stores, a team of buyers may travel around visiting their suppliers.Keeping sales people "on the road" is much more expensive than employing them to work in the office, Much of the sales people’s time is spent unproductively traveling. Telephone selling may use this time more productively, but a face-to-face meeting and discussion is much more effective. Companies involved in the export trade often have a separate export sales force. Its travel and accommodation expenses may be very high. As a result, servicing overseas customers may often be done by phone, telex (电传)or letter, and personal visits may be less often. Many firms appoint an overseas agent or distributor (分销商) whose own sales force takes over responsibility for selling their products in another country The passage indicates that some companies use telephone selling because（）.
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