Have you ever heard of friendships among animals? At a zoo in France unusual friendship developed between a cat and a bear.
No one （know） how the friendship first began. One day, some （worker） in the zoo noticed a black cat was in the bear's cage（笼子），and the two animals were playing together peacefully. They were surprised well the small cat seemed to get along with the large bear. The bear keeper allowed the cat to stay the bear. Later the pair and their unusual friendship became a hot topic at the zoo.
After several years, a new cage（build）for the bear. However, the cat was still in the same cage（angry） and cried to be with the bear. The bear keeper finally took pity on the cat and let it stay with the bear. The cat and the bear got （close） than before. They often sat together and shared meals in the sun.
Sometimes it may be natural for animals to have （they） own ideas about who would make a good friend. Humans usually expect animals to have relationships with others of the same kind, it may surprise them.
