句型变化 

1.The question is so hard that we can't understand it.        

1) too...  to句式_____     

2) enough句式_               

2.He didn't come here yesterday because of the heavy rain. (变为复合句)          

He didn't come here yesterday _____.      

3.Get up early, or you'll be late for the train, (变为条件状语从句)          

_____, you won't be late for the  train.        

4.If you speak more,  you'll speak better. (同义句)       

____you speak,____you'll speak.        

5.Wherever you go, I'll miss you for ever. （同义句)         

    __you go, I'll miss you  for ever.

为了研究慢性气管炎与吸烟量的关系，调查了272人吸烟量0～9支/h10～19支/h20支/h患者人数229825健康人数228916试检验慢性气管炎与吸烟量有无关系，用如下哪一种方法进行显著性检验

A．四格表X2检验
B．方差分析
C．t检验
D．行×列表资料x2检验
E．符号秩和检验