阅读下面的材料,按要求回答问题。(4分)      冬去春来,乍暖

阅读下面的材料,按要求回答问题。(4分)

     冬去春来,乍暖还寒,人们在起床时发现窗外的世界陷入了茫茫雾海,这样的天气广东人称为“回南天”。回南天是一种天气返潮现象,一般出现在二三月份,因为冷空气走后,暖湿气流迅速反攻,使气温回升,空气湿度加大,一些冰冷的物体表面遇到暖湿气流后,容易产生水珠。“回南天”出现时,空气湿度接近饱和,墙壁甚至地面都会“冒水”,到处是湿漉漉的,空气似乎都能拧出水来。浓雾是“回南天”的最具特色的表象。据统计,回南天现象严重时可使能见度降至50米。

1)“回南天”形成的主要原因是                                                  

                                                         (不超过50个字)(2分)

2)“回南天”的主要特征是                                                      

                                                          (不超过15个字)(2分)

答案

 

 

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