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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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.

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.