摘要： - Must I finish writing the composition today? - Yes, you . A. must B. can C. need D. may
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27、现有A．氧气、B碳、C镁、D氧化铜、E水、F空气、G、碳酸氢铵（NH4HNO3）、H、氢氧化钙、I食盐水9种物质中，属于单质的是
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ABC
；属于化合物的是DEGH
；属于含氧元素的化合物，但不属于氧化物的是GH
；属于混合物的是FI
；属于含元素种类最多的化合物是G
．（填序号）Usually, there is a teacher-parent meeting in every school year. Some students enjoy it, some don’t. Tom, a little boy invited his mother to attend his school's first teacher-parent meeting. To the little boy's __36__, she said she would go. This __37__ be the first time that his classmates and teacher __38__ his mother and he felt __39__ of her appearance. Although she was a beautiful woman, there was a severe scar (疤痕) that 40 nearly the entire right side of her face. The boy never wanted to _41__ why or how she got the scar.
At the meeting, the people were __42__ by the kindness and natural beauty of his mother __43__ the scar, but the little boy was still embarrassed and 44 himself from everyone. He did, however, get within __45__of a conversation between his mother and his teacher.
The teacher asked __46__, "How did you get the scar on your face?"
The mother replied, "__47__ my son was a baby, he was in a room that caught fire. Everyone was __48__ afraid to go in because the fire was __49__，so I went in. As I was running toward his bed, I saw a long piece of wood coming down and I placed myself over him trying to protect him. I was knocked __50__ but fortunately, a fireman came in and saved both of us." She __51__ the burned side of her face. "This scar will be __52__, but to this day, I have never __53__ what I did."
At this point, the little boy came out running toward his mother with tears in his eyes. He held her in his arms and felt a great __54__ of the sacrifice (牺牲) that his mother had made for him. He held her hand 55 for the rest of the day.
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