单项选择题

A．How to properly display the foods.
B．How to keep perishable food frozen.
C．How to keep the shelves rotating.
D．How to make the adjustable shelves.
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单项选择题
A．The large gap between the rich and the poor.B．The development of capitalism.C．The Renaissance.D．The religious reform movement.
A．The large gap between the rich and the poor.
B．The development of capitalism.
C．The Renaissance.
D．The religious reform movement.
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formula
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