After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.
经过多年的激烈辩论，灰狼被重新引入黄石国家公园。十四只狼在加拿大被捕获并运送到公园。到去年为止，黄石的狼群数量已经增长到超过170只。

Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.
灰狼曾经在黄石地区和美国大陆的许多地方零星出现，但它们逐渐被人类的发展所取代。到了1920年代，狼实际上已经从黄石地区消失。它们进一步向北迁移到加拿大的深林中，那里人类较少。

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 consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park’ s red foxes, and completely drove away the park’ s beavers.
狼的消失带来了许多意想不到的结果。鹿和麋鹿种群——狼的主要食物来源——迅速增长。这些动物消耗了大量的植被，减少了公园内植物的多样性。在没有狼的情况下，土狼种群也迅速增长。土狼杀死了公园内大部分的红狐，并完全赶走了公园的海狸。

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 opposed the plan because they feared that wolves would kill their farm animals or pets.
早在1966年，生物学家就要求政府考虑将狼重新引入黄石公园。他们希望狼能够控制麋鹿和土狼问题。许多农民反对这个计划，因为他们担心狼会杀死他们的农场动物或宠物。

The government spent nearly 30 years coming up with a plan to reintroduce the wolvers. 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 fores 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.
政府花了将近30年的时间来制定重新引入狼的计划。美国鱼类和野生动物服务局仔细监控和管理黄石的狼群。如今，关于灰狼在黄石适应得如何的辩论仍在继续。麋鹿、鹿和土狼的数量有所下降，而海狸和红狐已经复苏。黄石的狼项目是一个有价值的实验，帮助生物学家决定是否将狼重新引入该国的其他地区。

1. What is the text mainly about?
   A.Wildlife research in the United States.
   B.Plant diversity in the Yellowstone area.
   C.The conflict between farmers and gray wolves.
   D.The reintroduction of wolves to Yellowstone Park.
   答案：D

2. What does the underlined word “displaced” in paragraph 2 mean?
   A.Tested. B.Separated. C.Forced out. D.Tracked down.
   答案：C

3. What did the disappearance of gray wolves bring about？
   A.Damage to local ecology. B.A decline in the park’s income.
   C.Preservation of vegetation. D.An increase in the variety of animals.
   答案：A

4. What is the author’s attitude towards the Yellowstone wolf project？
   A.Doubtful. B.Positive. C.Disapproving. D.Uncaring.
   答案：B