如图所示为A、B两单摆振动的xt图象，两单摆的振动周期T_A∶T_B=__________，摆长l_A∶l_B=__________.

按要求改写句子。

1．滚滚的春潮击溃了坚冰。  

   “被”字句：                                                                                                         

   “把”字句：                                                                                                         

2．小伟写的字真不好？

     肯定句：                                                                                                             

     反问句：                                                                                                              

3．他怎么能怪一只不善于控制自己感情的鸟呢？

     陈述句：