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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单项选择题
Which of the statements is true of gorillas
A．They prefer to stay near their home.
B．They move from place to place within a limited area.
C．They are followed when they travel by other animals.
D．They move around looking for food according to a fairly regular pattern.
单项选择题
The writer says that primates show little hostility ______.
A．towards soldiers and other human beings
B．except towards animals such as lions, leopards, tigers or wild cats
C．unless their own particular area is invaded
D．towards other groups of the same species of monkey or ape
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