2018高考英语二轮复习阅读理解话题学案(六)世界与环境ppt课件(55页,含答案)

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  • 课件名称: 2018高考英语二轮复习阅读理解话题学案(六)世界与环境ppt课件(55页,含答案)
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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.
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.