【題目】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 (放棄）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】試題分析:從1972年以來國(guó)家公園管理局頒布了一項(xiàng)政策：對(duì)于由閃電引起的自然火災(zāi)采取放任態(tài)度，認(rèn)為這有助于自然平衡。但是1988年黃石自然公園的大火發(fā)生后，這項(xiàng)制度被廢除了，因?yàn)榛馂?zāi)會(huì)帶來巨大的損失。

【1】句意：一些森林起火這是真的。此處ｉｔ是形式主語，ｔｈａｔ引導(dǎo)真正的主語從句，可知答案為ｔｈａｔ。

【2】句意：為了保持生態(tài)平衡。此處是動(dòng)詞不定式做目的狀語，答案為ｔｏ�。耄澹澹�。

【3】句意：為了保持生態(tài)平衡，或被允許燃燒，然而，１９８８年在Yellowstone National Park的一場(chǎng)大火引起政策被遺棄，因?yàn)榇蠡鹱畛踉试S燃燒，不久失控。前后是一種轉(zhuǎn)折關(guān)系，可知答案為However。

【4】句意：結(jié)果，１９８８年的大火毀掉了Yellowstone的大部分，它是美國(guó)最古老最摯愛的公園。可知答案為oldest。

【5】句意：大量燒毀變黑的樹迎接游客。根據(jù)句意可知用名詞的復(fù)數(shù)形式，答案為ｖｉｓｉｔｏｒｓ。

【6】句意：公園的生態(tài)系統(tǒng)被毀的無法修補(bǔ)。beyond ｒｅｐａｉｒ無法修補(bǔ)，可知答案為beyond。

【7】句意：大量的動(dòng)物被大火燒死。句子用一般過去時(shí)態(tài)的被動(dòng)語態(tài)，主語是great numbers of animals復(fù)數(shù)形式，可知答案為were killed。

【8】句意：大火被狂風(fēng)驅(qū)使，一天多達(dá)１０英里的速度移動(dòng)�，F(xiàn)在分詞做自然的結(jié)果狀語，答案為ｍｏｖｉｎｇ。

【9】句意：大火快速的前進(jìn)，沒有給野生動(dòng)物逃生的機(jī)會(huì)。根據(jù)句意可知用一般過去時(shí)態(tài)，答案為ｇａｖｅ。

【10】句意：預(yù)科的數(shù)量快速地下降。副詞修飾動(dòng)詞，答案為rapidly。

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