“In humans, there are obvious sex differences in children's toy play, and these are remarkably similar across cultures，” says Kahlenberg. “While socialization by elders and peers has been the primary explanation, our work suggests that biology may also have an important role to play in activity preferences.”

　　In 14 years of data on chimpanzee behavior at the Kibale National Park in Uganda，Kahlenberg and Wrangham counted more than 100 examples of stick­carrying.

　　Some young chimpanzees carried sticks into the nest to sleep with them and on one occasion built a separate nest for the stick. “We have seen juveniles occasionally carrying sticks for many years, and because they sometimes treated them rather like dolls, we wanted to know if in general this behavior tended to represent something like playing with dolls，” says Wrangham, a Professor at Harvard. “If the doll hypothesis (假设) was right, we thought that females should carry sticks more than males do, and that the chimpanzees should stop carrying sticks when they had their first child. We have now watched enough young chimpanzees to prove both points.”

　　1．What does a female chimpanzee do with sticks?

　　A．She gives them to her child to play with.

　　B．She treats them as weapons.

　　C．She treats them as dolls.

　　D．She makes useful tools from them.

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