Geologists working during the nineteenth century understood rock bodies, they would have to concentrate on natural processes that continue at a constant rate and that also leave some sort of tangible record in the rocks. Evolution is one such process, and geologist Charles Lyell (1797-1875) recognized this. BY comparing the amount of evolution exhibited by marine mollusks then, Lyell estimated that 80 million years had elapsed since the beginning of the Tertiary Period. He came astonishingly close to the mark, since it was actually about 65 million years. However, for older sequence of evolutionary development, estimates based on parts in the fossil record. Rates of evolution for many orders of plants and animals were not well understood. 根据上面原文 2. It can be inferred form paragraph 2 that Charles Lyell based his study of the marine mollusk fossils on which of the following assumptions? A. The Tertiary Period was separated into division of time that were equal in length. B. Mollusks lived under rocks in the sea during the Tertiary period. C. Evolution of mollusks proceeded at a uniform rate over time D. Mollusks have evolved less rapidly with the passing of time 答案是c 可是从这句 BY comparing the amount of evolution exhibited by marine mollusks then, Lyell estimated that 80 million years had elapsed since the beginning of the Tertiary Period. 应该是说8000万年很快就飞逝过去 怎会会uniform rate over time? --

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