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
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
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
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