单项选择题

A．They don’t get rid of flabby arms.
B．They can damage arm muscles.
C．They aren’t acceptable to most people.
D．They can raise one’s blood pressure.
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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.
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.
填空题
formula。
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