题目

科学探究题。在本课学习中，我们已经知道磁铁能隔着一些物体吸引铁，那么磁铁能隔着水吸引铁吗?试着做下面的实验：在杯子里装上水，放几根铁钉，然后将一块磁铁放入水里，移动杯子，铁钉会，由此得出结论：. 答案：【1】吸附在磁铁上【2】磁铁能隔着水吸引铁制物体31、My father was a foreman of a sugar-cane plantation in Rio Piedras, Puerto Rico. My first job was to drive the oxen that ploughed the cane fields. I would walk behind an ox, 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 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. 51. The writer’s first job was _______. 　 A. to stand down the fairway at a golf course 　 B. to watch over the sugar-cane plantation 　 C. to drive the oxen that ploughed the cane fields 　 D. to spot the balls as they landed so the golfers could find them 52. 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 53. _______ 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 54. Which of the following statements is true according to the passage? 　 A. He wanted to be a successful golfer. 　B. He wanted to run a golf course near his house. 　C. He was satisfied with the job he got on a plantation. 　D. He wanted to make money by guiding oxen with a broomstick.