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  3. Mt. St. Helens Mt. St. Helens is a volcano in the state of Washington in the western United States. In May, 1980, it erupted

Mt. St. Helens Mt. St. Helens is a volcano in the state of Washington in the western United States. In May, 1980, it erupted

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问题                 Mt. St. Helens
    Mt. St. Helens is a volcano in the state of Washington in the western United States. In May, 1980, it erupted with the force of a nuclear bomb. According to scientists, there had been no volcanic eruption to equal this one in the last 4,000 years. When Mt. St. Helens exploded, it released energy that was greater than the bomb that destroyed Hiroshima, Japan. The force was strong enough to send 100 million tons of dust into the atmosphere. A force that strong had tremendous effects on the area around the volcano.   
    The visible effects were awesome. Once there had been green meadows and thick forests; after the eruption, there was black volcanic rock and ash. From the air, thousands of acres of trees looked like scattered matchsticks. Where there had once been clear streams and lakes, there were only bubbling pools of mud. Once the mountain had stood tall; afterwards, most of its top and all of its north side were missing. The force of the eruption reduced the mountain from the fifth tallest in the state to the thirtieth tallest.
    The economic effects on the area were staggering. The U. S. Forest Service estimated that $ 200 million worth of timber was destroyed. This was enough timber to build 200,000 homes. Businesses and homes simply disappeared under tons of rock, ash, and mud. The port of Portland, sixty miles to the south, was clogged with mud and ash. Cargo ships from all over the world suddenly sat helpless. Economists estimated the commercial and personal damages is the billions of dollars.
    Finally, the effects on human life were tragic. Thirty-four bodies were recovered in the weeks following the eruption; twenty-seven more people simply disappeared. Some of the sixty-one were photographers and scientists who were there to record the stirring of the mountain. They thought that there would be a warning before the final eruption; there was none. Other victims were campers and workers who were deceived by the apparent calm of the mountain that bright, sunny spring morning. One—a crusty, old man who owned a little resort five miles from the mountain—had refused to leave. He said that he was part of the mountain and the mountain was part of him. His words turned out to be true; his body was never found.
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答案 All in all, it is impossible to calculate the total effects of the eruption. It will take thousands of years for the geographical damage to be erased. The economy of the area will perhaps never recover. Businesses have closed, never to reopen; the lakes and rivers, which had attracted visitors, are gone forever; the logging industry had no trees to cut. Human life, of course, can never be replaced.
解析     浏览全文可知，这篇记叙文包括三大部分：开头段、数个主体段和结论段。开头段为第一段，介绍了Mt．St．Helens火山的起源及发展情况(导入语)。这样的火山给它周围的环境带来了很大的影响(主题思想句)。在第二～四段中讲述了火山对周围环境、人们生活的巨大影响。文章的展开方式是采用的列举法。在准确判断原文的写作方式和写作特点后，我们在补充缺省段落时，就可以采用类似的方法，这样保证整个主体段落的连贯与一致性就很容易了。
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