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图22为我国两大重要的商品农业生产基地分布图。甲为长中下游地区的洞庭湖平原、鄱阳湖平原，东北地区的平原、三平原。读图，完成下列问题。（10分） （1）下表反映甲、区域平原地区农作物的差异性，对比分析产生这一差异的主要自然原因。（4分） 区域 粮食作物 经济作物 甲 水稻 油菜、棉花等 乙 春小麦、玉米 甜菜、大豆等 （2）指出平原地区农业发展的不利自然条件并简述解决措施。（3分） （3）与甲区域相比，乙区域农业发展的优势区位条件有（   ）（选择填空）（2分） ①地广人稀②资源丰富③适于大规模机械化耕作④劳动力充足⑤耕地面积广大 A. ②④    B. ②③⑤    C. ②⑤    D. ①③⑤ （4）说出甲、区域共同面临的生态环境问题。（1分）
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