在中国历史上，分裂和统一的局面曾交替出现。结束东汉末年以来近四百年分裂局面，有一次实现全国统一的关键人物是 [ ]

A、杨坚

B、李渊

C、李世民

D、武则天

句型转换

1.  —Is Da ming's father drinking water now? (作肯定回答)   

     —           _ ,  _             

2.  She is walking to school．(改为一般疑问句)   

               _    _                          to school?

3.  I  play computer games every Saturday. (用now改为现在进行时的句子) 

     I           _               computer games now.

4. The foreigners (外国人) are taking photos on the Great Wall．(对画线部分提问) 

              _ are the foreigners  _       on the Great Wall?.

5. Tony is eating an ice-cream.(对画线部分提问)    

                 _          Tony eating?