单项选择题

A．Before the end of the month.
B．At the beginning of the year.
C．Next month.
D．Any time.
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单项选择题
A．The ultimate content remains the same.B．The vitamin content is reduced.C．The food becomes poisonous.D．Vitamin is added to the food.
A．The ultimate content remains the same.
B．The vitamin content is reduced.
C．The food becomes poisonous.
D．Vitamin is added to the food.
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