单项选择题

A．Suffering poor health.
B．Causing anxiety.
C．Becoming aggressive.
D．Destroying personal contact.
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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.
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