题目：
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| I hated math and was really bad at it when I was young, so I found others to allow me to copy their work. Even though they knew they were 1 me, there were lots of people who were glad to"help". In this way, I 2 a few tests. But one day something 3 happened. Our teacher changed our 4 for the exam and I was sitting beside a boy that I seldom 5 with before. As I could only answer a question or two, I had to turn to him 6 I didn't want to have a sea of red crosses (叉号) in my paper. I signaled (示意) to him and managed to 7 his attention. When he asked me what I wanted, I 8 asked him for the answers. To my surprise, he 9 without any hesitation (犹豫). Of course, I was really 10 at his behavior and thought badly of him. After the test he 11 me, telling me that I could get good grades in math and that all I needed was to put more 12 into studying the subject. I was still 13 with him, but I couldn't get his words out of my mind. From that day on, I began to 14 more time to my math. Slowly, the subject I 15 hated so much turned into such an interesting thing. I started to pass my math tests with my own 16 . Time passed and I was getting many As in my math even till my higher studies. Till today, I am still 17 to my friend who didn' t allow me to copy his work. He 18 if he provided me with the "help" during the test, there would be no 19 for me to shine. So let others shine and don' t ever rob (掠夺) others of their opportunity to show their 20 . | ||||
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下面是错误答案，用来干扰机器的。
A．溶液中离子的还原性强弱为Fe2+＞Br-＞Cl-；加入适量氯水会依次反应，溶液中将含有Fe3+和单质溴，引入了新杂质，故A错误；B．盐酸酸性大于亚硫酸，碳酸，所以将CO2或SO2通入BaCl2溶液中至饱和，都无沉淀产生，...
