若一元二次方程（m﹣1）x²+3m²x+（m²+3m﹣4）=0有一根为零，则m=[ ]

A．1

B．﹣4

C．1或﹣4

D．﹣1或4

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：