[請益] 黃金閱讀 The Geologic History of the Mediterranean

看板TOEFL_iBT (TOEFL_iBT托福)作者catwalk39 (says who)時間15年前 (2010/11/18 18:35)推噓2(2推 0噓 7→)

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第二段 Another task for the Glomar Challenger’s scientists was to try to determine the origin of the domelike masses buried deep beneath the Mediterranean seafloor. These structures had been detected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling. Were they salt domes such as are common along the United States Gulf Coast, and if so, why should there have been so much solid crystalline salt beneath the floor of the Mediterranean? 第三段 With question such as these clearly before them, the scientists aboard the Glomar Challenger processed to the Mediterranean to search for the answers. On August 23, 1970, they recovered a sample. The sample consisted of pebbles of gypsum and fragments of volcanic rock. Not a single pebble was found that might have indicated that the pebbles came from the nearby continent. In the days following, samples of solid gypsum were repeatedly brought on deck as drilling operations penetrated the seafloor. Furthermore, the gypsum was found to possess peculiarities of composition and structure that suggested it had formed on desert flats. Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions. As they drilled into the central and deepest part of the Mediterranean basin, the scientists took solid, shiny, crystalline salt from the core barrel. Interbedded with the salt were thin layers of what appeared to be windblown silt. What is the main purpose of paragraph 3? (1)To describe the physical evidence collected by Hsu and Ryan. (2)To explain why some of the questions posed earlier in the passage could not be answered by the findings of the Glomar Challenger. 答案是(1) 為什麼不是(2)呢? 謝謝大家! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.168.80.141