根据课文内容回答问题。
1．阮恒举手时为什么“颤抖”？为什么把手“放下去”，又“举起来”？
                                                                                                                
                                                                                                                 
2．医生“用轻柔的声音安慰他”，他“立刻停止了哭泣”，“好像刚才什么事也没有发生一样”这是为什么？
                                                                                                                                   
                                                                                                                                   

【考点】课文理解，课文背诵

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