The chimpanzees behaved especially altruistically toward partners who either patiently waited or gently reminded them that they were there by drawing attention to themselves. They were less likely to reward partners who pressured through making a fuss, begging persistently or spitting water at them. This is opposite to a long-standing view that the chimpanzees only share food under pressure.

　　66. The word " altruism " (paragraph 1) is closest in meaning to ______.

　　A. selflessness

　　B. selfishness

　　C. willingness

　　D. reluctance

　　67. Recent researches are performed with less complicated implements mainly to ______.

　　A. test chimps’ social tendencies instead of tool skills

　　B. see whether chimps are willing to share food with others

　　C. find out if chimps are likely to reward partners

　　D. show that chimps are only good at using implements

　　68. What can be learned from the passage?

　　A. Chimps are usually unwilling to share.

　　B. Chimps take others’ needs and wishes into consideration.

　　C. It is more likely that chimps will reward partners who give them pressure.

　　D. Human altruism evolved only after humans separated from their ape relatives.

　　69. Which of the following might be the best title of the passage?

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