题目：
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| I live in a big city with a lot of homeless people. Luckily there're small ways of helping them and you needn't have a lot of 1 . One way to help is to buy their monthly magazine. 2 doing this one day, I got to_ 3 a young homeless man. He was often 4 the magazine at the train station. He was a poor farmer from another country. After a while, I discovered that his 5 was close to mine. It 6 that we were born in the same month. I met him last year 7 after his birthday, and after congratulating(祝贺) him, without 8 , I asked if he had had a good day. He 9 and said that he hadn't really celebrated. I felt so 10 . I just couldn't bear the thought of (不敢想)this nice, young man being 11 on his 25th birthday with no presents, no cake, nothing! So I went home and looked in my yarn(纱线) basket. 12 for me, I had enough yarn 13 . I set to work and knitted(编织) a 14 for the young man. The yarn had become a little dirty 15 I didn't knit very often. Then I washed the yarn so the scarf would be 16 when he got it. I met him on my own birthday as I was going shopping. I had 17 to meet him so I had 18 the scarf and a piece of my own birthday 19 around with me. He was very happy with these gifts and so was I. The 20 in his eyes was the best present he could have given me! | ||||
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答案：B题目分析：A．1mol MnO2与含2mol H2O2的溶液共热，二氧化锰做催化剂，不溶解。B．1mol铜投入含4mol HNO3的浓硝酸中，全部溶解。C．1mol铜与含2mol H2SO4的浓硫酸共热，随反应的进行，硫酸浓度不断降低...
