美国是世界上的农业大国，农业生产效率高，成本低，产品市场竞争

美国是世界上的农业大国，农业生产效率高，成本低，产品市场竞争力强。这种特点形成的主要原因是

①气候条件优越

②耕地广阔，土壤肥沃

③高度机械化和区域生产专业化

④农业科技发达

A．①② B．①③ C．②③ D．③④

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美国是世界上的农业大国，农业生产效率高，成本低，产品市场竞争

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