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
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单项选择题
From what Warneken said in the passage, we can infer that ______.
A．no other nonhuman primate can be as altruistic as chimpanzees
B．altruism has never been observed in any nonhuman animals before
C．chimpanzees did not display altruism in their previous experiments
D．it is the first time they have conducted experiments about chimpanzees
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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