题目：
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| I used to live selfishly, I should admit. But one moment changed me. I was on my lunch break and had 1 the office to get something to eat. On the way, I 2 a busker (街头艺人),with a hat in front of him. I had some 3 in my pocket, but I would not give them to him, thinking to myself he would 4 use the money to feed his addiction to drugs or alcohol. He 5 like that type-young and ragged. 6 what was I going to spend the money on ? Only to feed my addiction to Coca-Cola or chocolate! I then 7 I had no right to place myself above 8 just because he was busking. I 9 and dropped all the coins into his 10 , and he smiled at me, I watched for a while. As 11 as it sounds, I expected something more to come from that moment-a feeling of 12 or satisfaction, for example. But nothing happened 13 , I walked off. “It proved to be a waste of 14 ,”I thought. On my way home at the end of the 15 , I saw the busker again and he was 16 . I watched him pick up the hat and walk 17 a cafe counter. There he poured the 18 contents into a tin collecting 19 an earthquake fund-raising event. He was busking for charity！ Now I donate any 20 I have to charity tins and enjoy the feeling of giving. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
氯化钠8.700g，溴化钾为：0.500g，氯化钙为：0.800g．设混合物中各物质的质量：NaCl为x g，KBr为y g，CaCl2为z gx+y+z=10．000 g①2KBr+Cl2====2KCl+Br2混合物中KBr转化为KCl，灼烧后溴全部挥发，因此：x+y+z...
