单项选择题

The story of J. B. S. Haldane is mentioned in the text ______.

A．to honor his unusual altruistic acts.
B．to show how he contributed to the country.
C．to introduce the topic of human altruism.
D．to give an episode of his calculation abilities.

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单项选择题

The writer mentioned the case of the hunter who shares his spoils with others to demonstrate ______.

A．innate human hostility.
B．his privileged status.
C．apparent human altruism.
D．his sacrifice resources.

单项选择题

It can be inferred from Paragraph 4 that ______.

A．human behavior is confined to the exclusive concern of psychologists.
B．economists' utility is only the explanations for random acts of kindness.
C．altruism is developed during the long process of human evolution.
D．biologists can help economists explain some human behavior deviations.