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(B)

    We use our smart phones to do many things every day. Many of us depend on them very much. However, it is bad for our eyes and health to use too much phone.

    A study shows that smart phone owners usually start to use their phones early in the morning. They check personal emails and WeChat. And before they get out of bed, many people often check the weather, read news, and send a message or talk to friends. After getting up, they often take photos of food, themselves, and even whatever they can see with their phones. They share their photos with their friends. The research finds that users pick up their phones more than 1,500 times to do different things in a week. And the smart phone users are on their phone for three hours and sixteen minutes a day. That is to say, people use their phones for almost one full day each week.

    Using phones will take much time and it's also bad for our health. Many people stay up late to play phones. And mobile phones will influence our sleep. Without using the phones, many people will feel sad. Many owners also find they use their phones without knowing they're doing so.

    Now, many people are getting worse because the game King of Glory comes out, even the little children begin to spend too much time on it.

    How do you think people use their phones too much?

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    After years of debate, gray wolves were reintroduced (重新引进) 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 pans 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 framers were against the plan because they feared that wolves would kill their farm animals or pets.

    The government spent nearly 30 years thinking lip 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.