单项选择题

A．The advantage of refrigeration.
B．Food preservation in the summer.
C．Cooking food in the summer.
D．Fun in the summer.
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单项选择题
A．Clean air, much food and more exercise.B．Clean air, fresh food and less exercise.C．Clean air, fresh food and simple life.D．Hard work, much food and simple life.
A．Clean air, much food and more exercise.
B．Clean air, fresh food and less exercise.
C．Clean air, fresh food and simple life.
D．Hard work, much food and simple life.
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