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

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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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