题目：
| 完形填空。 | ||||
| One night last summer, my neighbor Debbie came over and knocked on my door. "I'm leaving for 1 , Jim," she said. "Would you mind dropping by my house a bit and 2 on my mother?" "Not a problem," I said. I'd lived next door to Debbie and her 84-year-old 3 , Nan, for about six months, and we'd become fast friends. Debbie always worked at night. She 4 leaving her mom alone, so she asked if it was okay if she rigged up (装配) one of those baby monitors and 5 me a receiver. I was 6 to help. After all, I've been blind since infancy and out of work for years. In fact, at 54, I'd come to wonder if I had much 7 anymore. Like me, Nan was 8 -and was also hard of hearing. That evening Nan and I chatted for a bit 9 . "If you're okay," I said, "I think I'll go back." Before I 10 , I made sure the baby monitor was working. "Good night, Nan," I said. I 11 my cane and headed out of the door. "See you tomorrow," Nan called behind me. I locked the door and 12 my way home. Several minutes 13 , I heard a sound. It was Nan on the 14 . "Jim! Jim!" I heard over the monitor. "The house is 15 ! Help!" I went as 16 as I could to Debbie's. I got to the front door. I could 17 a heavy, thick smoke. I put my hand on the doorknob, and reached for my key and 18 the door. "Here, Jim. Help!" Her voice was weak. "Let's get out of here!" I shouted. Grabbing her hand, I started to move on. I tapped with my cane 19 we found the front door. We felt our way down the steps, 20 in the sweet, fresh summer air, and to the gate of her yard. "Thank you, Lord. We're all safe." | ||||
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答案：
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（1）ACD （2）4FeS+3O2 + 12H+= 4Fe3++6H2O+4S （3）Fe(或铁) （4）蒸发皿、玻璃棒 （5）C（6）促进Fe3+的水解 （7）31.1%题目分析：（1）固体W中含有S、SiO2,将其灼烧。其中的S会变为SO2气体，SO2气体...
