Although salt is now seen as harmful to health, it has been used for centuries a

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问题 Although salt is now seen as harmful to health, it has been used for centuries as method of ______foods.

选项 A、maintaining
B、preserving
C、manufacturing
D、reserving

答案 B

解析 preserve“保存”；maintain“保养；维持；维修”；manufacture“生产制作”；reserve“保留”。

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