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(2010·浙江余杭高级中学高三上第二次月考)      1.Centuries ago, ____ man discovered that removing moisture(水分)from food helps to preserve it, and that the easiest way to do this is to expose ______ food to sun and wind.

A. a; the       B. the; 不填        C. 不填; the       D. the; the

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