（1）干旱频次>30的地区有：                                                                                                                

（2）我国干旱灾害严重的地区主要分布在气候比较湿润的季风区，其原因是什么？
                                                                                                                              

（3）为减轻旱灾，应采取的措施有：                                                                                                     
                                                                                              

（4）说明北方地区、南方地区发生旱灾的季节及其原因。
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                

（5）说明东部地区旱灾损失严重的原因。