单项选择题

The speaker went on and on, ______ to his listeners' obvious boredom.

A．obligated
B．obsessive
C．obvious
D．oblivious
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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 conflict in human societies
C．distinguish between two kinds of opposition
D．summarize the that characteristic featare of opposition and cooperation
单项选择题
According 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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