四级词汇练习（3）

Two hours from the tall buildings of Manhattan and Philadelphia live some of the world’s largest black bears. They are in northern Pennsylvania’s Pocono Mountains, a home they share with an abundance of other wildlife.

　　The streams, lakes, meadows, mountain ridges and forests that make the Poconos an ideal place for black bears have also attracted more people to the regio n. Open spaces are threatened by plans for housing estates and important habitats are endangered by highway construction. To protect the Poconos’ natural beauty from irresponsible development. The Nature Conservancy named the area one of America’s “Last Great Places”.

　　Operating out of a century