07指导每日一练MBA-英语精读汇粹五十五
文章作者 100test 发表时间 2007:02:25 09:10:31
来源 100Test.Com百考试题网
Passage Thirty-five (Exploration on the Origin of Continents)
The origin of continental nuclei has long been a puzzle. Theories advanced so far have generally failed to explain the first step in continent growth, or have been subject to serious objections. It is the purpose of this article to examine the possible role of the impact of large meteorites or asteroids in the production of continental nuclei. Unfortunately, the geological evolution of the Earth’s surface has had an obliterating effect on the original composition and structure of the continents to such an extent that further terrestrial investigations have small chance o
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