2. 外语
  3. 　　　　　　　　　　Nature’ s Gigantic Snowplough 　　On January 10, 1962, an enormous piece of glacier broke away and tumbled down the si

　　　　　　　　　　Nature’ s Gigantic Snowplough 　　On January 10, 1962, an enormous piece of glacier broke away and tumbled down the si

admin2009-06-10  72
问题 　　　　　　　　　　Nature’ s Gigantic Snowplough
  　　On January 10, 1962, an enormous piece of glacier broke away and tumbled down the side of a mountain in Peru. A mere seven minutes later, when cascading ice finally came to a stop ten miles down the mountain, it had taken the lives of 4,000 people.
　 　This disaster is one of the most devastating examples of a very common event: an avalanche of snow or ice. Because it is extremely cold at very high altitudes, snow rarely melts. It just keeps piling up higher and higher. Glaciers are eventually created when the weight of the snow is so great that the lower layers are pressed into solid ice. But most avalanches occur long before this happens. As snow accumulates on a steep slope, it reaches a critical point at which the slightest vibration will send it sliding into the valley below.
　 　Even an avalanche of light power can be dangerous, but the Peruvian catastrophe was particularly terrible because it was caused by a heavy layer of ice. It is estimated that the ice that broke off weighed three million tons. As it crashed down the steep mountainside like a gigantic snowplough, it swept up trees, boulders and tons of topsoil, and completely crushed and destroyed the six villages that lay in its path.
　 　At present there is no way to predict or avoid such enormous avalanches, but, luckily, they are very rare. Scientists are constantly studying the smaller, more common avalanches, to try to understand what causes them. In the future, perhaps dangerous masses of snow and ice can be found and removed before they take human lives.  
The passage is mostly about______.
选项 A、avalanches.
B、glaciers.
C、Peru.
D、mountains.
答案A
解析 此题为一般推理题。据第2段第1句、第3段第1句、第4段第1句等可以推知。其他三个选择均明显不符。
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