| 雅思官方白金级合伙伙伴

　　北京新航道学校致力于雅思培训为大家提供权威参考资料。暑假已经结束了，赶在这个时间参加雅思的考生朋友们也完成了自己的学习计划，总结这个暑期的阅读试题，我们为大家进行了整理，希望对那些正在准备考试同学有所帮助。雅思阅读对于国内考生来说难度较大，除了专业水平之外，还极度考验着同学的耐心和细心。下面就给大家一些资料，希望对于同学的英语成绩有所帮助。

　　本期为大家整理的阅读试题比较多，一部分练习的题目会跟在下面一篇文章中，请同学们知悉。

　　A The eruption in May 1980 of Mount St. Helens, Washington State, astounded the world with its violence. A gigantic explosion tore much of the volcano's summit to fragments; the energy released was equal to that of 500 of the nuclear bombs that destroyed Hiroshima in 1945.

　　B The event occurred along the boundary of two of the moving plates that make up the Earth's crust. They meet at the junction of the North American continent and the Pacific Ocean. One edge of the continental North American plate over-rides the oceanic Juan de Fuca micro-plate, producing the volcanic Cascade range that includes Mounts Baker, Rainier and Hood, and Lassen Peak as well as Mount St. Helens.

　　C Until Mount St. Helens began to stir, only Mount Baker and Lassen Peak had shown signs of life during the 20th century. According to geological evidence found by the United States Geological Survey, there had been two major eruptions of Mount St. Helens in the recent(geologically speaking)past: around 1900 B.C., and about A.D. 1500. Since the arrival of Europeans in the region, it had experienced a single period of spasmodic activity, between 1831 and 1857. Then, for more than a century, Mount St. Helens lay dormant.

　　D By 1979, the Geological Survey, alerted by signs of renewed activity, had been monitoring the volcano for 18 months. It warned the local population against being deceived by the mountain's outward calm, and forecast that an eruption would take place before the end of the century. The inhabitants of the area did not have to wait that long. On March 27, 1980,a few clouds of smoke formed above the summit , and slight tremors were felt. On the 28th, larger and darker clouds,. consisting of gas and ashes,. emerged and climbed as high as 20,000 feet. In April a slight lull ensued, but the volcanologists remained pessimistic. The, in early May, the northern flank of the mountain bulged, and the summit rose by 500 feet.

　　E Steps were taken to evacuate the population. Most- campers, hikers, timbercuttersleft the slopes of the mountain. Eighty-four-year-old Harry Truman, a holiday lodge owner who had lived there for more than 50 years, refused to be evacuated, in spite of official and public, including an entire class of school children, wrote to him, begging him to leave. He never did.

　　F On May 18, at 8.32 in the morning, Mount St. Helens blew its top. literally. Suddenly, it was 1300 feet shorter than it had been before its growth had begun. Over half a cubic mile of rock had disintegrated . At the same moment, an earthquake with an intensity of 5 on the Richter scale was recorded. It triggered an avalanche of snow and ice. mixed with hot rock-the entire north face of the mountain had fallen away. A wave of scorching volcanic gas and rock fragments shot horizontally from the volcano's riven flank, at an inescapable 200 miles per hour. As the sliding ice and snow melted, it touched off devastating torrents of mud and debris, which destroyed all life in their path. Pulverised, which destroyed all life in their path. Pulverised rock climbed as a dust cloud into the atmosphere. Finally, viscous lava, accompanied by burning clouds of ash and gas, welled out of volcano's new crater, and from lesser vents and cracks in its flanks.

　　G Afterwards, scientists were able to analyse the sequence of events. First, magmamolten rock-at temperatures above 2000oF. had surged into the volcano from the Earth's mantle. The build-up was accompanied by an accumulation of gas, which increased as the mass of magma grew. It was the pressure inside the mountain that made it swell. Next, the rise in gas pressure caused a violent decompression. Which ejected the shattered summit like a cork from a shaken soda bottle. With the summit gone, the molten rock within was released in a jet of gas and fragmented magma, and lava welled from the crater.

　　H The effects of the Mount St. Helens eruption were catastrophic. Almost all the trees of the surrounding forest, mainly Douglas firs. were flattened. and their branches and bark ripped off by the shock wave of the explosion. Ash and mud spread over nearly 200 square miles of country. All the towns and settlements in the area were smothered in an even coating of ash. Volcanic ash silted up the Columbia River 35 miles away, reducing the debris that accumulated at the foot of the volcano reached a depth. in places, of 200 feet.

　　I The eruption of Mount St. Helens was one of the most closely observed and analysed in history. Because geologists had been expecting the event, they were able to amass vast amounts of technical data when it happened. Study of atmospheric particles formed as a result of the explosion showed that droplets of sulphuric acid, acting as a screen between the Sun and the Earth's surface, caused a distinct drop in temperature. There is no doubt that the activity of Mount St. Helens and other volcanoes since 1980 has influenced our climate . Even so, it has been calculated that the quantity of dust ejected by Mount St. Helens - a quarter of a cubic mile- was negligible in comparison with that thrown out by earlier eruptions, such as that of Mount Katmai in Alaska in 1912 (three cubic miles). The volcano is still active. Lava domes have formed inside the new crater, and have periodically burst. The threat of Mount St Helens lives on.

　　经过老师课堂经验发现，雅思阅读对考生来说就是不能合理分配阅读题干的时间和答题时间，这还需要同学在平日里多加练习，以便应试速度，老师提醒大家，成绩绝非一朝一夕之事，勤奋练习才能收益。最后祝你考试顺利。

　　点击了解雅思培训信息