题目：
| 完形填空。 | ||||
| It was a cool October evening. Excitement and family members 1 the hall. I was only a 7-year-old girl, but I was the center of 2 . Finally, after weeks of preparation, I would 3 all my hard work in a dance of performance. Everything would be 4 -so I thought. I waited backstage all 5 in my black tights with a golden belt. In a loud and clear voice, the master of ceremonies 6 that my class was next. My dance class was doing a routine on wooden boxes two feet by two feet, facing the 7 . All I had to do in the next move was put one foot on the box next to mine and keep my other foot on my box. I really was an 8 move. I was concentrating so much 9 the huge smile on my face and holding my head up that I did not look 10 I was going. I missed my partner's box altogether and 11 . There I was standing on the stage floor when my classmates were on top of their boxes. I could hear giggles (咯咯笑) coming from the audience, and I felt the 12 rush to my face. I remembered my dance teacher had told us, "If you make a mistake, keep smiling so the audience will not 13 ." I did my best to follow her 14 as I continued with the routine. When the curtain dropped, so did my 15 for the evening. I 16 bitterly, tasting the salt from the tears that streamed down my face. I ran backstage, but no one could 17 me down. Recently I realized I had been a 18 that night. I was 19 , but I fought the urge to run off the stage. 20 , I finished the routine with a smile on my face. Now when friends and family laugh about the time I slipped during a dance performance, I can laugh too. | ||||
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答案：D题目分析：A项：稀H2SO4与活泼金属反应中H+提现氧化性，故错；B项：“黑面包”实验体现了浓H2SO4的脱水性，故错；C项：浓H2SO4在常温下与铁、铝发生钝化现象，也发生了反应，故错。故选D。点评：本题考查...
