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阅读以下说明，回答问题1-4。[说明]某工程数据库关系表如下：工程工程号负责人工程所在地010王海峰北京011杜昌盛广州012李黎上海013胡兴福北京工作人员工程号姓名人员编号所在部门工作天数010丁明11078策划部15010余立新15892技术部32010毛利文33265文档编辑部16011陶德66536测量部9011秦文娟22357公关部17012余立新15892技术部7012汪楠10275后勤部28012沈伟34859文档编辑部5013周宇高19087策划部3013钱亮12984技术部6 [问题1] 找出关系表“工程”和表“工作人员”所有可能的候选键及外键；

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某年8月23日15时45分，在L省S市某城市给水管网改造工程管沟土方施工过程中，施工现场发生沟壁土方坍塌事故，造成3名施工人员死亡，1人重伤，1人轻伤。直接经济损失40余万元。事故发生过程： L省S市某城市给水管网改造工程，属于市政建设工程。由市自来水公司负责实施建设。 A建筑公司在得到该工程建设信息前两个多月，即6月19日以“便函”形式，委托外单位员工贺某以本单位项目部经理身份前往市自来水公司联系承揽该项工程。该项工程于6月27日开标，A建筑公司未能中标。但是由于中标单位缺少垫资资金，市自来水公司与中标单位经过协商之后，未报市招标办同意，擅自将该工程的部分工程环节改由A建筑公司承包建设，并通知贺某将此决定转告该公司。7月26日，市自来水公司与A建筑公司签订了该城市给水管网改造建设工程施工合同。8月10日，A建筑公司生产管理部刘某将该工程转包给无任何施工安全资质的贺某，双方并签订了“A建筑公司内部项目工程承包合同书”。该市的某监理公司经理薛某派没有执业资格的徐某负责该工程监理。贺某在组织施工中发现，已开挖的管沟中心线位置略向北偏移，不符合施工要求，需要重新返工修整。8月23日，工程承包人临时雇用S市的8名流散人员承包该部分管沟清理修整工程。23日早8时，被临时招雇的8人在没有书面交底的情况下，开始清理管沟。按照工程承包人的要求，将深1.9m的管沟南侧底部向内掏挖0.6m．并在1.9m的基础上深挖0.3m，挖出的土方堆放在管沟南侧顶端。15时45分，管沟清理修整已基本完成，承担清理修整工程的8名临时工人中，有5人在管沟内休息。由于管沟南侧帮底已被掏空，加之施工段为三类土质，管沟南侧顶端堆积土较厚，造成管沟南侧24m长的侧壁坍塌，坐在管沟内休息的5人被突如其来的坍塌土方埋在管沟内，虽经多方抢救，仍有3人死亡、1人重伤、1人轻伤。问题：1.请从技术、管理等方面分析该事故发生的原因。

C A typical lion tamer（驯兽师）in people’s mind is an entertainer holding a whip( 鞭) at a chair. The whip gets all of the attention, but it’s mostly for show. In reality, it’ the chair that does the important work. When a lion tamer holds a chair n front of the lion’s face, the lion tries to focus on all four legs of the chair at the same time. With its focus divided, the lion becomes confused and is unsure about what to do next. When faced with so many options, the lion chooses to freeze and wait instead of attacking the man holding the chair. How often do you find yourself in the same position as the lion How often do you have something you want to achieve (e.g. lose weight., start a business, travel more)—only to end up confused by all of the options in front of you and never make progress This upsets me to no end because while all the experts are busy debating about which option is been the people who want to improve their lives are left confused by all of the conflicting information. The end result is that we feel like we cant’ focus or that we’re focused on the wrong things, and so we take less action, make less progress, and stay the same when we could be improving. It doesn’t have to be that way. Anytime you find the world waving a chair in your face, remember this: All you need to do is focus on one thing,. You just need to get started. Starting before you feel ready is one of the habits of successful people. If you have somewhere you want to go, something you want to accomplish, someone you want to become…take immediate action. If you’re clear about where you want to go, the rest of the world will either help you get there or get out of the way. Why does the lion tamer use a chair

A. To trick the lion.
B. To show off his skills.
C. To get ready for a fight.
D. To entertain the audience.

听第 8段材料,回答第 10至 12题。 Why are the speakers making the trip

A. For business.
B. For shopping.
C. For holiday.

听第 9段材料,回答第 13至 16题。 How much can a new person earn for the first year

A. $10,500.
B. $ 12,000.
C. $ 15,000.