单项选择题

The phrase "function in the disservice of one another" (Para. 1) most probably means ______.

A．betray each other
B．harm one another
C．help to collaborate with each other
D．benefit one another
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单项选择题
In the first paragraph, the author gives the definitions of some terms in order to ______.
A．argue for the similarities between animal societies and human societies
B．smooth out the conflicts in human societies
C．distinguish between two kinds of opposition
D．summarize the characteristic features of opposition and cooperation
单项选择题
According to the author, competition differs from conflict in that ______.
A．it results in war in most cases
B．it induces efforts to expand territory
C．it is a kind of opposition among social entities
D．it is essentially a struggle for existence
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