填空题

National Parks In American (1) , priority is given to the amusement of the public. But for the National Parks, the priority is (2) The first national park called Yellowstone was founded in Wyoming in (3) . Every year, 2.5 million people visit this park. American national parks are kept (4) No tree-felling is allowed. Sometimes, even natural forest (5) are allowed to burn themselves out. American national parks are run by the (6) , who are not only conservationists, but also guides. They answer visitors’ questions on the plants, animals and (7) of the parks. They are also trained policemen. They must be ready to handle (8) of all kinds. In the mountains and forests of the northwestern states, there is a most ferocious carnivore in the world-- (9) . But this kind of carnivore is now protected. If a policeman in the park has to shoot one in the case of danger, they use (10) instead of bullets.