Mark Twain once found his desk was damaged in some way的意思

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• Mark Twain once found his desk was damaged in some way的意思
• One day Mark Twain told a story about his first money.　　Schoolboys in those days didn't respect(尊敬)their teachers.They didn't take care of school things,either.The school had a rule:If a student damaged(损坏)his desk,the teacher would beat him in front of the whole school,or the student had to pay five dollars.　　Mark Twain once found his desk was damaged in some way,he had to tell his father about the school's rule.His father thought it would be too bad
• Mark Twain once found his desk was damaged in some way的意思
• 一张比例尺1:1000的图中,有一块三角形的草坪测得面积为2.5平方厘米,实际面积是多少平方米算式
• 在比例尺为1：200的平面图上,画一个半径是2厘米的圆,这个圆的实际面积是多少平方分米?