题目

如图所示为某同学做“验证力的平行四边形定则”的实验装置,该装置为水平放置木板上固定一张白纸,一橡皮条的一端固定在白纸上的A点,另一端拴两个细绳套.  (1)下面为实验的一些操作步骤: ①比较F/和F大小,方向是否近似相同。 ②过O点用统一标度作出F、F1、F2的图示。 ③用一个弹簧测力计钩住细绳套，拉A至某点O，在纸上标出O点，记下拉力F的方向和大小。 ④用平行四边形定则作出F1、F2的合力F。 ⑤用两个弹簧测力计互成角度分别拉住两个细绳套 阅读理解。      Three days ago, the boss of a gold shop received a letter. As he was very busy, the letter was on his desk till dinner time. When he opened it, a $1000 note fell out onto the desk. With the note was a short letter: Dear sir,      I got married forty years ago. Unfortunately, at that time there was a lot of unemployment and I got no job. I was out of work for about six months before I got another one. Of course I was very short of money.      I came to your shop to buy a wedding ring one day. The assistant brought some rings for me to have a look, later she was called away for a moment, and then I put one of the rings into my pocket. When she came back, I said I did not know the size of my girlfriend's finger. So I left the shop with the ring but I didn't pay for it. My wife died a month ago, and the fact that I never paid for her ring has been on my conscience (让我良心不安) all these years. I always feel guilty about that. At that time the ring cost $100, and I think that is about ten times at today's price.      Now, I am sending you that amount.                                                                                                                                       Yours truly,                                                                                                                                       A customer      After reading the letter, the boss said, "Well, life is always full of surprise!" 1. The boss of the gold shop got a _____ 3 days ago. A. ring B. letter C. gold 2. The underlined word "unemployment" means "_____" in Chinese. A. 辞职 B. 失业 C. 就业 3. The ring the customer put into his pocket was _____ 40 years ago. A. $1000 B. $10000 C.$ 100 4. The customer wrote to the boss in order to _____. A. send the money for the ring B. say thanks to him C. return the ring 5. Which is NOT wrong according to the passage? A. The boss opened the letter by himself. B. The boss didn't think life was always full of surprise. C. When the customer's wife knew the fact, she was annoyed.