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  3. The United States established its first national park, Yellowstone, in 1872. Yellowstone was not only the first national park in

The United States established its first national park, Yellowstone, in 1872. Yellowstone was not only the first national park in

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问题     The United States established its first national park, Yellowstone, in 1872. Yellowstone was not only the first national park in America. It was the first in the world. Since then, about 100 nations have followed the example. They have【B1】______ over 100,000 national parks and protected areas for the enjoyment of people today and【B2】______ to come.
    The National Park Service in the United States【B3】______ a total of 401 "units", as it calls them. These include national parks,【B4】______ sites, monuments, buildings and battlefields(战场). They also include【B5】______ areas, seashores, rivers, trails and parkways—almost 34 million hectares(公顷)of land【B6】______. Visitors can walk in the woods. Climb mountains.【B7】______ animals. Explore Civil War battlefields. Go swimming. Ride horses. Or just enjoy a day outdoors with the beauty of nature.
    The National Park Service was created in 1916. It has two【B8】______ jobs. One is to protect the national parks. The other is to help visitors enjoy them.
    One way the National Park Service is able to【B9】______ is through the fees it charges. One hundred thirty-three sites charge entrance fees between $5 and $25. Each entrance fee is good for seven days. However, visitors can buy a yearly pass for $80. And people over 62 years old can buy a lifetime pass for $10. A free lifetime pass【B10】______ people with disabilities.
【B8】
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答案main
解析 此空需填入修饰成分，修饰其后的名词jobs。main“主要的”。
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