My father was a foreman of a sugar-cane plantation(甘蔗种植园) in Rio Piedras, Puerto Rico. My first job was to drive the oxen that ploughed(耕) the cane fields. I would walk behind an ox(牛), guiding him with a broomstick. For $ 1 a day, I worked eight hours straight, with no food breaks.

It was very tedious work, but it prepared me for life and taught me many lasting lessons. Because the plantation owners were always watching us, I had to be on time every day and work as hard as I could. I’ve never been late for any job since. I also learned about being respectful and faithful to the people you work for. More important, I earned my pay; it never entered my mind to say I was sick just because I didn’t want to work.

I was only six years old, but I was doing a man’s job. Our family needed every dollar we could make because my father never earned more than $ 18 a week. Our home was a three-room wood shack with a dirty floor and no toilet. Nothing made me prouder than bringing home money to help my mother, father, two brothers and three sisters. This gave me self-esteem(自尊心), one of the most important things a person can have.

When I was seven, I got work at a golf course(高尔夫球场) near our house. My job was to stand down the fairway and spot the balls as they landed, so the golfers could find them. Losing a ball meant you were fired, so I never missed one. Some nights I would lie in bed and dreamt of making thousands of dollars by playing golf and being able to buy a bicycle.

The more I dreamed, the more I thought. Why not? I made my first golf club out of guava limb(番石榴树枝) and a piece of pipe. Then I hammered an empty tin can into the shape of a ball. And finally I dug two small holes in the ground and hit the ball back and forth. I practiced with the same devotion and intensity. I learned working in the field — except now I was driving golf balls with club, not oxen with a broomstick. 

小题1:The word “tedious” in Paragraph 2 most probably means _______.

A．easy

B．boring

C．interesting

D．unusual小题2:The writer learned that_______ from his first job.

A．he should work for those who he liked most

B．he should work longer than what he was expected

C．he should never fail to say hello to his owner

D．he should be respectful and faithful to the people he worked for小题3:_______ gave the writer self-esteem.

A．Having a family of eight people

B．Owning his own golf course

C．Bringing money back home to help the family

D．Helping his father with the work on the plantation

[说明]
为了清除系统运行中发生的故障和错误，软、硬件维护人员要对系统进行必要的修改与完善；为了使系统适应用户环境的变化，满足新提出的需要，也要对原系统做些局部的更新，这些工作称为系统维护。系统维护的任务是改正软件系统在使用过程中发现的隐含错误，扩充在使用过程中用户提出的新的功能及性能要求，其目的是维护软件系统的“正常运作”。这阶段的文档是软件问题报告和软件修改报告，它记录发现软件错误的情况以及修改软件的过程。
在系统投入正常运行后，系统维护阶段就开始了。在信息系统中，一个重要的特点就是业务规则、业务流程会频繁发生变化，增加与删除业务的现象比较普遍。信息系统针对其他类型的软件系统而言，其系统维护更为重要，工作量也更大。

请简要说叫完善性维护、适应性维护、纠错性维护、预防性维护的含义。