Unit 5 The power of nature

　　Ⅰ.阅读理解

　　Old Faithful is a geyser(喷泉) located in Wyoming, in Yellowstone National Park in the United States. Old Faithful was named in 1870 during the Washburn­Langford­Doane Expedition and was the first geyser in the park to receive a name. The geyser, as well as the nearby Old Faithful Inn, is part of the Old Faithful Historic District.

　　On the afternoon of September 18, 1870, members of the Washburn­Langford­Doane Expedition traveled down the Firehole River from the Kepler Cascades(瀑布) and entered the Upper Geyser Basin. The first geyser they saw was Old Faithful. In his book of the expedition, Nathaniel P. Langford wrote：

　　Judge, then, what must have been our astonishment, as we entered the basin at mid­afternoon of our second day's travel, to see in the clear sunlight, at no great distance, a volume of clear, sparkling water projected into the air to the height of one hundred and twenty­five feet. “Geysers! Geysers！” cried one of our members, and, we soon gathered around this wonderful phenomenon. It was indeed a perfect geyser...We gave it the name of “Old Faithful”．

　　In the early days of the park, Old Faithful was often used as a laundry. Clothes placed in the geyser were ejected then completely washed when the eruption took place. It's been found that linen and cotton cloth was uninjured by the action of the water, but woolen clothes were torn to pieces.

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