填空题 For 25 years now, Jane Goodall has been studying chimpanzees in the wild, at Gombe in Tanzania. After ten years, she wrote her best-selling book, In, the Shadow of Man, chronicling her research until then. But if she had stopped there she would have left the world with a misleadingly benign(温和的) view of chimpanzees.

填空题 How long ago did Goodall write her book?

填空题 How did the "warfare" change Goodall's opinion of chimp society?

填空题 What's the purpose of" the reference to "long sticks"?

填空题 If you stick something on a chimp's forehead and show him a mirror, how will he react?

填空题 What did some of the chimps in the northern group enjoy doing?