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联合国一个机构说，世界食品价格12月升到历史新高，原因是糖、粮食和油料作物的生产成本提高，以及恶劣天气对一些作物收成的影响。
A UN agency says that the cause for the rise of food price in the world range is the rise of cost in producing sugar, grains and oil crops, as well as the effect of bad weather on some crops.