单项选择题

According the theory of kin selection, humans tend to act altruistically ______.

A．for the sake of desired reproduction.
B．out of self-interest.
C．on the request of natural selection.
D．because of kind nature.
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单项选择题
As pointed out in the text, reciprocal altruism theory and strong reciprocity theory are ______.
A．complementary.
B．contradictory.
C．superficial.
D．over-simplified.
单项选择题
By Miuccia Prada was obviously biting her nails (Paragraph 1), the author means ______.
A．Prada is in a desperate situation.
B．Prada is notorious for her hasty execution.
C．Prada is always in her bad habit.
D．Prada is too much engaged in her work.
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