After years of debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and moved to the park. By 2016, the Yellowstone wolf population had grown to more than 170.
Gray wolves once were seen here and there in the Yellowstone area and other parts of United States, but they were gradually displaced by human development. By the 1920s, wolves had disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around. The disappearance of the wolves had many unexpected results. Deer and elk populations—major food sources(来源)for the wolf—grew rapidly. These animals ate large amounts of plants, which reduced plant diversity(多样性)in the park. With the disappearance of gray wolves, coyote(草原狼)populations also grew quickly. The coyotes killed a great number of red foxes in the park, and completely drove away the park’s beavers(河狸).
As early as 1966, biologists asked the government to consider reintroducing wolves to Yellowstone Park. They hoped that wolves would be able to control the elk and coyote problems. Many farmers were against the plan because they feared that wolves would kill their farm animals or pets.
The government spent nearly 30 years thinking up a plan to reintroduce the wolves. The U. S. Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone. Today, the debate continues over how well the gray wolf is fitting in at Yellowstone. Elk, deer, and coyote populations are down, while beavers and red foxes have made a comeback. The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.
【小题1】What does the underlined word “displaced” in paragraph 2 mean?| A．Killed one by one. | B．Separated from relatives. |
| C．Forced to move out. | D．Followed secretly. |
| A．The number of deer increased fast. | B．More people moved into the park. |
| C．Red foxes ate too many plants. | D．Beavers in the park were all killed. |
| A．they believed it could keep the park back to normal |
| B．they knew the government was considering that too |
| C．they were sure it would solve the elk and coyote problems. |
| D．they thought farmers needn’t worry about animals and pets |
| A．Wildlife research in the United States. |
| B．Plant diversity in the Yellowstone area. |
| C．A war between American farmers and gray wolves. |
| D．The reintroduction of wolves to Yellowstone Park. |
