题目：
| 完形填空。 | ||||
| When I was a small child, during the war, we were very poor and we lived in a faraway village. One day, on the road, I found the 1 pieces of a mirror. There was a Garman motorcycle accident. I tried to find all the pieces and put them 2 , but it was not possible, so I kept only the 3 piece and I made it round. I could 4 with it as a toy and became greatly attracted by the 5 that I could reflect (反射) light to dark places where the sun would never shine-in 6 holes and some other dark places. It became a 7 for me to get light into the darkest places I could find. I 8 the little mirror, and, as I 9 up, I would take it out when I had nothing to do and 10 the game, As I became a 11 , I grew to understand that this was not 12 a child's game but a metaphor (象征) for what I might do with my life. I came to 13 that I am not the light or the source of light. But light-truth, understanding, knowledge-is 14 , and it will shine in many dark places only if I reflect it. I am just a single piece of a mirror whose 15 design and shape I do not know. 16 , with what I have I can reflect light into the dark places of this 17 -into the black places in the 18 of men-and change some things 19 some people. Perhaps others may see and do the same. This is what I am about. This is the 20 of my life. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
BDSO3+H2O= 2H++SO42—，而在强酸性的溶液中，Ba2+可生成BaSO4沉淀，而将SO2不能存在。
，经正交变换化为标准形：
。