单项选择题

A．Once a week.
B．Twice a week.
C．Three times a week.
D．Four times a week.
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单项选择题
A．They both live in communities.B．They both have soldiers to defend their societies.C．They both show great capacity for learning.D．They both have a division of labor.
A．They both live in communities.
B．They both have soldiers to defend their societies.
C．They both show great capacity for learning.
D．They both have a division of labor.
填空题
considerably
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