广安市罗渡中学2015
高考英语阅读理解一轮自练（2）（答案）《
山东省潍坊市2014高考英语3月模拟
试题》 starting in l972，the national park service established a policy for forest fires calle natural burn．it was acknowledged that some forest fires，such as those caused by lightning were necessary for forests to maintain balanced ecosystems，so the fire should be allowed to burn．however, a big fire in yellowstone national
