杨杨 (化名 )今年 5周岁，刚来幼儿园时，他和小朋友友好相处，上课时也爱动脑筋，可是最近他变得有很多心事似的，总是一个人在那里。 　　实例一：今天上午我上音乐课，当小朋友热烈地讨论小花猫的表情和动作的时候，班上许多小朋友都积极动脑、发言。我看见杨杨小朋友也很认 Yang Yang (a pseudonym) is 5 years old this year. When he first came to kindergarten, he was friendly with children and used his brains when he was in class. But recently he has become a lot of people who are always there. Example 1: I went to the music class this morning. When children enthusiastically talked about the expression and movement of the kitten, many children in the class actively braved their speeches. I saw Yang Yang children also recognize