下面的字你会认读吗？请按要求归类。

    莹    牲    触    盏    撕    幢    铃    轰    榜    警    印    烁

1．声母是翘舌音的字：                                                                                                     

2．韵母是后鼻音的字：                                                                                                     

3．整体认读音节的字：                                                                                                    

两个正方形的边长相等，周长也一定相等．______（判断对错）