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A. Vegetable oil is insoluble in water, and it is mixed with water to form an emulsion, so A is correct;
B. Salt is easily soluble in water and forms evenly.
1. The stable mixture belongs to the solution, so A is wrong;
C. MSG is easily soluble in water and forms uniformly.
1. The stable mixture belongs to the solution, so C is wrong;
D. Sucrose is easily soluble in water and forms uniformly.
1. The stable mixture belongs to the solution, so D is wrong
So choose A
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