Lesson50 Yellowstone National Park
A national park is a large piece of land where animals are free to come and go． Trees and plants grow everywhere． People go to a national park to enjoy nature． Many people stay in campgrounds in national parks． They sleep in tents and cook their food over campfires． They also walk on trails or paths in the parks． On a gate at the entrance of Yellowstone， a sign says， “For the Benefit and Enjoyment of the People．”
Yellowstone is the world's oldest national park． It became a national park in 1872． It is also the world's largest park． It covers parts of the states of Wyoming， Montana， and Idaho． Yellowstone is two-and-a-half times the size of the smallest state， Rhode Island．
Yellowstone is famous for its geysers． These holes in the ground shoot hot water into the air． There are about seventy geysers in the park． The most famous is Old Faithful． About every hour Old Faithful shoots hot water hundreds of feet into the air．Two-and-a-half million people visit this beautiful park each year． Park rangers give information to visitors． They also take care of the park． They tell visitors not to pick the flowers． They also tell them not to feed or hunt the animals．

campground ? 露营地
campfire ? 篝火
trail 小径，踪迹
geyser ? 间歇泉

黄石国家公园

国家公园是一大片动物可以自由走动的土地。到处都生长着树木植物。人们可以在其中享受自然。许多人在国家公园里露营。他们睡在帐篷里，用篝火烧食物。人们在公园的小径上散步。在黄石国家公园进口，大门上写着这样一条标语：“为了人们的利益与快乐。”
黄石国家公园是世界上最早的国家公园，始于1872年。它还是世界上最大的公园。它横跨怀俄明州、蒙大拿州和爱达荷州的部分地方。黄石国家公园是最小的州罗得岛州的2?5倍。
黄石国家公园的间歇泉非常有名。这些地下的洞将热水喷射到空中。公园里大约有70座间歇泉，其中最著名的是老信徒。大约每隔1小时它就会将热水喷射到几百英尺高的空中。
每年都有250多万人前来参观这个美丽的公园。公园管理员会为游客提供信息。他们同时也照看这个公园。他们告诉游客不要摘花，不要喂食或射猎动物。