题目：
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| A while ago, I didn't think I had a passion. I would sit in front of the TV all day and not think about anything except the next 1 . At that time, I didn't know how 2 it was to have a passion in our life. The first 3 I thought about this was in the seventh grade when I went to school with my mom. As we stopped at a red light, someone 4 my eyes. It was a man dressed in old 5 standing on the other side of the 6 . This homeless man was not sitting down with a sad and hopeless 7 . He was standing,waving his hands and dancing. He looked happy and held a radio as if it was the most 8 thing he had. Seeing all this 9 me. "Mom, why does that man have a radio even though he's homeless?" I asked. "He bought it," she replied. I was still 10 . "But if he's homeless, why doesn't he use his money to buy clothes? He 11 his money on something he doesn't need. He should buy food." "Well, Sarah, sometimes food isn't the most important thing. 12 can be food for the 13 . Food and clothes aren't the only things we need. People need happiness to stay 14 , too." I wasn't sure whether I 15 my mother's words. Maybe my mom was right. If one lives in sadness, there's 16 to keep him moving from day to day. Now I 17 that I've had passions all along, but never recognized their importance in my life. They were invisible (无形的) hopes that I 18 without knowing them. What's often forgotten is that we all need a 19 , a light on a 20 day. We all need a passion. | ||||
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(I) 2Na2SO3+ O2 ==2Na2SO4。(II)假设3： Na2SO3部分变质 。①SO32-离子， ②5SO32-+2MnO4-+ 6H+ =5SO42- +2Mn2++3H2O；③现象：若加盐酸产生气体，加BaCl2无白色沉淀生成 ；(III)（1） 关闭开关P和分液...
