读下图回答：

（1）将岛屿名称的代号填在图上：A北海道岛 B本州岛 C四国岛 D九州岛 （2）将图中代号所在的工业区名称填写在下列横线上：
①                  ④                   ⑤                       ⑦                         ⑨                            （3）日本经济的特点是：    
①                                                                                                             
②                                                                                                         
③                                                                                                          （4）日本工业集中在太平洋沿岸的原因是                                                                                   。