1． 读北美图：

 （1）海洋A                                                                 

              B                                                                

              C          

         山脉D          

（2）     城市E    、F     

                                                            A

                                                             E ○              B

                                                             F ○ D       

                                                                      C

（3）简述美国东部发展工业的有利条件：