题目内容
【题目】Starting in 1972,the National Park Service established a policy for forest fires called Natural Bum. It was true 【1】 some forest fires, such as those which were caused by lightning were necessary for forests 【2】 (keep) balanced ecosystems, so the fire should be allowed to burn 【3】, a big fire in Yellowstone National Park in 1988 caused this policy to be abandoned (放弃）since the fire was initially allowed to bum yet soon out of control. As a result, the fire of 1988 destroyed much of Yellowstone, which is Americas 【4】(old) and most beloved national park. Massive areas of plants were destroyed, and large empty spaces and acres of burned and blackened trees greeted 【5】 (visit). The rivers and streams were choked with ash, and the ecosystem of the park was changed 【6】 repair.
In addition, great numbers of animals 【7】 (kill) by the fires that burned out of control. The fires were driven by high winds, 【8】 (move) as many as ten miles a day. Many small animals died in the flames. The fires' rapid advances 【9】 (give) the wildlife little chance to escape. Even today, few of these small forest animals have returned to live in the park. In the years immediately following the fires, the numbers of visitors declined 【10】(rapid).
【答案】
【1】that
【2】to keep
【3】However
【4】oldest
【5】visitors
【6】beyond
【7】were killed
【8】moving
【9】gave
【10】rapidly
【解析】试题分析:从1972年以来国家公园管理局颁布了一项政策：对于由闪电引起的自然火灾采取放任态度，认为这有助于自然平衡。但是1988年黄石自然公园的大火发生后，这项制度被废除了，因为火灾会带来巨大的损失。
【1】句意：一些森林起火这是真的。此处ｉｔ是形式主语，ｔｈａｔ引导真正的主语从句，可知答案为ｔｈａｔ。
【2】句意：为了保持生态平衡。此处是动词不定式做目的状语，答案为ｔｏ ｋｅｅｐ。
【3】句意：为了保持生态平衡，或被允许燃烧，然而，１９８８年在Yellowstone National Park的一场大火引起政策被遗弃，因为大火最初允许燃烧，不久失控。前后是一种转折关系，可知答案为However。
【4】句意：结果，１９８８年的大火毁掉了Yellowstone的大部分，它是美国最古老最挚爱的公园。可知答案为oldest。
【5】句意：大量烧毁变黑的树迎接游客。根据句意可知用名词的复数形式，答案为ｖｉｓｉｔｏｒｓ。
【6】句意：公园的生态系统被毁的无法修补。beyond ｒｅｐａｉｒ无法修补，可知答案为beyond。
【7】句意：大量的动物被大火烧死。句子用一般过去时态的被动语态，主语是great numbers of animals复数形式，可知答案为were killed。
【8】句意：大火被狂风驱使，一天多达１０英里的速度移动。现在分词做自然的结果状语，答案为ｍｏｖｉｎｇ。
【9】句意：大火快速的前进，没有给野生动物逃生的机会。根据句意可知用一般过去时态，答案为ｇａｖｅ。
【10】句意：预科的数量快速地下降。副词修饰动词，答案为rapidly。
