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ark. By last year, the Yellowstone wolf population had grown to more than 170 wolves.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.The disappearance of the wolves had many unexpected results. Deer and elk populations — major food sources (來(lái)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 pletely drove away the park’ s beavers.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. The government spent nearly 30 years ing up with a plan to reintroduce the wolvers. The . 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 eback. 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. is the text mainly about? research in the United States. diversity in the Yellowstone area. conflict between farmers and gray wolves. reintroduction of wolves to Yellowstone Park. does the underlined word “displaced” in paragraph 2 mean?. . out. down. did the disappearance of gray wolves bring about? to local ecology. decline in the park’s ine. of vegetation. increase in the variety of animals. is the author’s attitude towards the Yellowstone wolf project?. . . D. Uncaring.DThe Intelligent Transport team at Newcastle University have turned an electric car into a mobile laboratory named “DriveLAB” in order to understand the challenges faced by older drivers and to discover where the key stress points are. Research shows that giving up driving is one of the key reasons for a fall in health and wellbeing among older people, leading to them being more isolated(隔絕) and inactive. Led by Professor Phil Blythe, the Newcastle team are developing invehicle technologies for older drivers which they hope could help them to continue driving into later life. These include custommade navigation(導(dǎo)航) tools, night vision systems and intelligent speed adaptations. Phil Blythe explains: “For many older people, particularly those living alone or in the country, driving is important for preserving their independence, giving them the freedom to get out and about without having to rely on others.” “But we all have to accept that as we get older our reactions slow down and this often results in people avoiding any potentially challenging driving conditions and losing confidence in their driving skills. The result is that people stop driving before they really need to.”Dr Amy Guo, the leading researcher on the older driver study, explains, “The DriveLAB is helping us to understand what the key points and difficulties are for older drivers and how we might use technology to address these problems. “For example, most of us would expect older drivers always go slower than every