单项选择题

In which aspect are wolves greatly different from monkeys and apes

A．Competitiveness.
B．Cooperation.
C．Dominance.
D．Hieratical creatures.
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单项选择题
Why is the co-operative spirit present in such pack-hunter as wolves largely absent the world of the primates
A．Because wolves are more defensive and aggressive than primates.
B．Because primates are more friendly than wolves.
C．Because it is not so difficult for primates to obtain food as for wolves.
D．Because primates are not territorial animals.
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