In order to double the number of wild tigers in the 26 ten years, the World Wildlife Fund(世界自然基金会) has started a program recently. It 27 to save wild tigers and put an end to tiger hunting and killing. China, together with twelve other 28 , has joined in it. ...
But details like these have received extra attention since December, when a female Siberian tiger escaped her enclosure (围栏) at the San Francisco Zoo. The 4-year-old, 350-pound cat killed one person and injured two others. The incident raised fears among zoo goers and sent staff at zoos...