按要求写句子。 

1．我看大海。 

     扩句：                                                                                                                                          

2．在轻轻荡漾着的溪流的两岸，满是高过马头的野花。

     缩句：                                                                                                                                          

3．有哪一个春天的花园能比得过这时天山的无边繁花呢？

     改陈述句：                                                                                                                                    

4．融化的雪水，从高悬的山涧、从峭壁断崖上飞泻下来。 

     改为比喻句：                                                                                                                               

给水管网系统承担供水的输送、分配、压力调节和（）调节任务，起到保障用户用水的作用。

A.水质

B.用户

C.水量

D.管线