Chimps obviously live in groups of between 20 and 50 animals. Within these groups they form small groups. The most basic group consists of females or females plus infants. Adult females spending much time together often turn out to be mother and daughter, or sisters. Mother and infants live together, at least for four or five years. During this time the young learn from their mother and from other chimps. An infant will spend much time playing with other infants. After this five-year period, contact with the mother is still maintained.

(91 words)

　　Which of the following is the most suitable title for this passage?
　　 A) Family Life of Chimps. 　　　　
　　 B) Relationships Between Mother and Daughter Chimps.　　　　
　　 C) Five Years to Raise a Baby Chimp.
　　 D) Contact within chimps.
　　　　

<<Pre　 >>Next