照样子写句子。

1．例：女娲补天是神话故事，夸父追日也是神话故事。

     (1)燕子是候鸟，                                                                 。 

     (2)                                                                                                                                 。

2．例：夸父颓然倒了下来。     

            夸父就像一座大山颓然倒了下来。  

     (1)夸父奔跑起来。

                                                                                                                                          。

     (2)太阳炙烤着大地。

                                                                                                                                           。

光在其中传播速度快的，称为光密介质。