3、请用简洁的语言概括本文各段的大意.

[答]第一段：                                                                       

第二段：                                                                      

第三段：                                                                  

第四段：                                                                        

第五段：                                                                       

第六段：                                                                      

 2、本文开头描写冬天萧条冷落的景象有什么作用?

[答]                                                                             

1、解释词语并给加点字注音.

阴霾(        )                                                                

销声匿迹(    )                                                                  

涵养(      )                                                                   

4、依牵牛星的移动速度,它会和太阳相撞吗?为什么?

[答]                                                                               

3、请给第二段分层,并概括层意。

第一层(                   )                                                       

第二层(                              )                                             

2、本文段除了首句所运用的说明方法外,还运用了那些?

[答]                                                                             

1、第一段画横线的语句的说明方法是        ,作用是                                

11、本文段主要运用的说明方法是