题目：
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| I found out one time that doing a favor for someone could get you into a lot of trouble. I was 1 the eighth grade at the time, and we were having a final 2 . During the test, the girl 3 next to me whispered something, but I didn't understand. So I leaned over her way and found out that she was trying to ask me 4 I had an extra pen. She showed me that 5 was out of ink and would not write. I happened to have an extra one, so I took it out of my pocket and put it on her desk. Later, after the test papers had been 6 the teacher asked me to 7 in the room when all the other students 8 . As soon as we were alone, she began to talk to me 9 it meant to grow up; she mentioned how important it was to stand 10 your own two feet and be responsible for your own acts. For a long time, she talked about honesty and emphasized the fact 11 people do something dishonest, they are really 12 themselves. She made me promise that I would think 13 about all the things she had said and then she told me I could 14 . I walked out of the room wondering 15 she had chosen to talk to me about all those things. Later on, I found out that she thought I had cheated on the test. When she saw me lean over to talk to the girl next to me, it looked 16 I was copying answers 17 the girl's test paper. I tried to explain about the pen, but all she could say was it seemed very strange to her that I hadn't 18 anything about the pen the day she talked to me right after the test. 19 I tried to explain that I was just doing the girl a favor 20 he use my pen. I was sure she continued to believe that I had cheated on the test. | ||||
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答案：B题目分析：溶液中的氢离子既包括硝酸电离的又包括硫酸电离的．所以氢离子的物质的量为：n=0.4mol•L-1×0.1L+0.1mol•L-1×0.1L×2=0.06mol，硝酸根的物质的量n=0.4mol•L-1×0.1L=0.04mol，硝酸和铜反应...
