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【参考答案】

periodically
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单项选择题
A．They run about and hunt for food.B．They collect but do not produce their own food.C．They do not rely on clear division of labor.D．They lead a completely agricultural way of life.
A．They run about and hunt for food.
B．They collect but do not produce their own food.
C．They do not rely on clear division of labor.
D．They lead a completely agricultural way of life.
单项选择题
A．At the airport.B．At the travel agency.C．In the student center.D．In a restaurant.
A．At the airport.
B．At the travel agency.
C．In the student center.
D．In a restaurant.
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