题目：
| 完形填空。 | ||||
| It was in my high school science class. I was doing a task in front of the classroom with my favorite shirt on. A 1 came, "Nice shirt," I smiled from ear to ear. Then another voice said, "That shirt belonged to my dad. Greg's mother works for my family. We were going to 2 that shirt away, but gave it to her 3 ." I was speechless. I wanted to hide. I 4 the shirt in the back of the closet and told my mum what had happened. She then dialed her 5 , "I will no longer work for your family," she told him. That night, Mom told my dad that she couldn't clean anymore; she knew her life's 6 was something greater. The next morning she 7 with the personal manager at the Board of Education. He told her that without a proper education she could not teach. So Mom decided to 8 a university. After the first year in college, she went back to the personal manager. He said, "You are 9 , aren't you? I think I have a 10 for you as a teacher's assistant. This opportunity deals with children who are mentally challenged with little or no chance of 11 ." Mom accepted the opportunity very 12 . For almost five years, as a teacher's assistant, she saw teacher after teacher give up on the children and quit, feeling 13 . Then one day, the personal manager and the principal 14 in her classroom. The principal said, "We have watched how you 15 the children and how they communicate with you and admire your hard-working 16 over the last five years. We are all in agreement that you 17 be the teacher of this class." My mom spent more than 20 years there. 18 her career, she was voted Teacher of the Year. All of this came about because of the 19 comment made in the classroom that day. Mom showed me how to handle 20 situations and never give up. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：A.Cu与浓硫酸发生反应产生SO2气体，将SO2气体通入到Ba(NO3)2溶液由于硝酸有强的氧化性，会把BaSO3氧化成BaSO4沉淀。错误。其它选项的试剂、现象及原因都正确。2气体的制备及化学性质的知识。
