读“美洲图”,回答下列问题:
(1)填出图中字母所代表的地理事物的名称:
    A____________山脉    B____________山脉    C____________山脉
    E____________河流    G____________岛屿    H____________群岛
(2)D高原大部分地区属于____________气候区,F河主要流经____________气候区。
(3)在北美洲中部为什么冬季寒冷的气流能长驱南下,并直达墨西哥湾沿岸?
                                                                                                                                                             
                                                                                                                                                            
(4)为什么亚马孙河水流平缓,水量特别丰富?
                                                                                                                                                              
                                                                                                                                                           
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