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

Through the experiments by Alicia Melis and her colleagues, we can conclude that ______.

A．chimpanzees know how to unlock the door to an adjacent room
B．chimpanzees can manage to reach a food tray from behind bars
C．chimpanzees understand cooperation and the way to secure it
D．chimpanzees are skilled at pulling on both ends of the rope

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