题目内容
The National Park Service
America's national parks are like old friends. You may not see them for years at a time, but just knowing they're out there makes you feel better. Hearing the names of these famous old friends--Yosemite, Yellowstone, Grand Canyon--revives memories of visits past and promotes dreams of those still to come.
From Acadia to Zion, 369 national parks are part of a continually evolving system. Ancient fossil beds, Revolutionary War battlefields, magnificent mountain ranges, and monuments to heroic men and women who molded this country are all a part of our National Park System (NPS). The cafe and preservation for future generations of these special places is entrusted to the National Park Service. Uniformed Rangers, the most visible representatives of the Service, not only offer park visitors a friendly wave, a helpful answer, or a thought-provoking history lesson, but also are skilled rescuers, firefighters, and dedicated resource protection professionals. The National Park Service ranks also include architects, historians, archaeologists, biologists, and a host of other experts who preserve and protect everything from George Washington's teeth to Thomas Edison's wax recordings.
Modern society has brought the National Park Service both massive challenges and enormous opportunities. Satellite and computer technologies are expanding the educational possibilities of a national park beyond its physical boundaries. Cities struggling to revive their urban cores are turning to the Park Service for expert assistance to preserve their cultural heritage, create pocket parks and green spaces, and re-energize local economies: Growing communities thirsty for recreational outlets are also working with the NPS to turn abandoned railroad tracks into bike and hiking trails, as well as giving unused federal property new life as recreation centers.
To help meet these challenges and take advantage of these opportunities, the National Park Service has formed partnerships--some dating back 100 years, some only months old--with other agencies, state and local governments, corporations, American Indian tribes and Alaska Natives, Park Friends groups, cooperating associations, private organizations, community groups and individuals who share the National Park ethic.
National Park Week 1996 is a celebration of these partnerships.
Why are America's national parks like old friends？
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A．so thatB．in thatC．considering thatD．by reason that
外部性的存在意味着边际社会成本小于边际私人成本。
所有的Nash均衡同时也是占优策略(dominant strategy)均衡。
听力原文： Have you ever dreamed of having a fashionable watch of great value？ A small watchmaker in Switzerland in 1922 designed the first automatic watch to show the day, month, and date. Only seven of these splendid watches were ever made and these watches were almost lost to history. Today, it is so hard to get an original watch that some watch historians are even willing to offer $200,000 for one.
These watches attracted a lot of people for their splendid color, fashionable style, and new uses in the 1920s. The owners of the watches were admired and set apart from the crowd. Because the number of the original watches is very limited, owning such a watch will make you feel very special.
Today, you are offered the same kind of watch with improvement. It has a 24-jewel mechanical movement, the kind desired by watch collectors. The watchmaker has made the movement of the watch much more modern with an automatic rotor so that the watch never needs to be wound by hand. The design on it. To get a watch in such a perfect design means to get a chance to know a piece of watch-making history and to wear such a watch will show your personal taste and social position.
You can get the watch either in person or by mail all an affordable price. You will also receive good service from the watch seller. If you are not satisfied with the watch after you get it, you may simply return it within 30 days. Don't miss the chance to realize your dream.
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