单项选择题

In the animal world, chimpanzees were believed ______.

A．to be collaborative and altruistic
B．to act independently and individually
C．to understand cooperation just as man does
D．to know how to achieve success with coordinated action

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热门试题

单项选择题

The passage is most probably taken from ______.

A．a news report
B．a science fiction
C．a research paper
D．a collection of experiments

单项选择题

The research led by Felix Warneken has proved that ______.

A．chimpanzees' cooperative ability has always been present
B．chimpanzees are as intelligent as 18-month old human children
C．chimpanzees and humans had common ancestor six million years ago
D．chimpanzees are willing to cooperate even without any form of reward