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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4] 为T定义完整性规则，“教授的工资不得低于2000元，如果低于2000元，自动改为2000元”。

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(二) [背景资料] 某工程项目建设单位与甲施工单位签订了施工承包合同。甲施工单位将桩基础工程分包给乙施工单位；将设备安装工程分包给丙施工单位，设备由甲施工单位采购。施工过程中发生了以下事件：事件1：甲施工单位质量检查人员检查时发现乙施工单位在工程上使用了一批未经检验且质量文件资料不全的钢筋，甲施工单位指令乙施工单位停工处理。事件2：甲施工单位负责采购的工程设备未能按合同约定的时间组织进场，造成丙施工单位未能按原定施工计划组织施工。事件2中，丙施工单位向甲施工单位可能的索赔要求有哪几种索赔文件由哪几部分组成

(三) [背景资料] 某工程项目建设单位与甲施工单位签订了施工承包合同。甲施工单位将桩基础工程分包给乙施工单位；将设备安装工程分包给丙施工单位，设备由甲施工单位采购。施工过程中发生了以下事件：事件1：甲施工单位质量检查人员检查时发现乙施工单位在工程上使用了一批未经检验且质量文件资料不全的钢筋，甲施工单位指令乙施工单位停工处理。事件2：甲施工单位负责采购的工程设备未能按合同约定的时问组织进场，造成丙施工单位未能按原定施工计划组织施工。简述该项目中工程参与各方的合同关系。

[听力原文]11-15(Q11)Larry Smith is one of the rescuers on the Golden Gate Bridge. His job is to save people who attempt to jump into the sea. If the telephone rings at three in the morning, he knows it’s trouble. (Q12)Someone is threatening to commit suicide. Larry will get his things ready and in no time he will be out of the door heading to the spot. Many suicide attempts are made on the spur of the moment and lives can be saved. But if you fail, if the person jumps into the bottom of the fog, there’s no describing (Q13)how helpless you feel. Often would-be jumpers are driven to despair and see no hope of getting out of their miser). The trick is to(Q14)open a channel of communication with them. Following are some tricks that have worked. “Hey, if you’re going to jump, at least give me your mum’s phone number. So I can call and tell her.”“That’s a nice watch. If you’re going to jump. can I have it” Sometimes all it takes is the voice of the human beingyou cares. Larry estimates he has rescued(Q15)38 people in his ten years of service. How many people did Larry approximately rescueApproximately（）

There is an old saying in English: "Laughter is the best medicine". Until recently, few people took the saying very seriously. Now, however, doctors have begun to investigate laughter and the effects it has on the human body. They have found evidence that laughter really can improve people’s health.Tests were carried out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing; it also works several groups of muscles in the face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial.Other tests have shown that laughter appears to be capable of reducing the effect of pain on the body.There is also some evidence to suggest that laughter helps the body’s immune system, that is, the system which fights infection.As a result of these discoveries, some doctors and psychiatrists (精神病学家)in the United States now hold laughter clinics, in which they try to improve their patients’ condition by encouraging them to laugh.1) Laughter really can (46) .2) In the first test, it was found that laughter has similar effects to (47) .3) Other tests have shown that laughter can reduce the effect of (48) on the body.4) There is evidence to show that laughter helps the body’s (49) .5) In the clinics, the psychiatrists try to improve their patients’ condition by encouraging them (50) . 47（）