按要求填空。 

1．“品”字形结构的字：                                                                              

2．描写春天的词语：                                                                                 

3．形容风景名胜的词语：                                                                           

4．请你写出一个城市的市名和市花：                                                               

对于任意整数n，多项式（n+11）²-（n+2）²都能被（　　）整除．

A．9

B．2

C．11

D．n+9