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In the process of drying certain kinds of fruits, sulphur fumes help

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In the process of drying certain kinds of fruits, sulphur fumes help ______.

remove their wax coating

kill off bacteria

maintain their color

crack their skin

Giải thích

Đáp án C
Giải thích: "In order to prevent darkening, pears, peaches and apricots are exposed to the fumes of burning sulphur before drying."