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试据图分析美国的地势特点以及对气候的影响。
                                                                                                                                                               
                                                                                                                                                               
                                                                                                                                                               
特点:两边高,中间低
影响:西部山脉阻挡了来自太平洋的水汽,中部低有利于夏季来自墨西哥湾的暖湿气流形成降水,而冬季冷空气可以长驱直入,形成寒冷的冬季
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