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人们在夏天少不了西瓜，但西瓜却不是本地植物，它的“老家”在非洲。千年前，契丹人从西域把种子捎到当时的幽州，这才有了“西瓜”的名号。当时的西瓜长啥样？从研发到推广 科学家培育出好吃好种的西瓜文天祥在《西
