将下面词语按要求归类。 

       载歌载舞        东张西望        一本正经        津津有味        大公无私   

       默默无闻        专心致志        迷惑不解        鞠躬尽瘁  

1．描写人物动作的：                                                                                                                    

2．描写人物神态的：                                                                                                                    

3．表现人物精神的：                                                                                                                   

A=2×3×5，B=3×5×7，A和B的最大公因数是______，最小公倍数是______．