编辑点评: GRE阅读考试的材料,非常强调逻辑的关系,所以逻辑要点是大家在解GRE阅读题的时候的关键,本文就为大家例举了这样一篇逻辑短文,供大家参考和练习。
随着GRE阅读考试的难度日益增加,大家需要有针对性地进行练习,本文为大家例举的就是逻辑短文的练习,文末还附有答案,供大家更好地练习。
Biologists have long maintained that two groups of pinnipeds, sea lions and walruses, are descended from a terrestrial bearlike animal, whereas the remaining group, seals, shares an ancestor with weasels. But the 5 recent discovery of detailed similarities in the skeletal structure of the flippers in all three groups undermines the attempt to explain away superficial resemblance as due to convergent evolution the independent develop-ment of similarities between unrelated groups in 10 response to similar environmental pressures. Flippers may indeed be a necessary response to aquatic life,turtles, whales, and dugongs also have them. But the common detailed design found among the pinnipeds probably indicates a common ancestor. Moreover,15 walruses and seals drive themselves through the water with thrusts of their hind flippers, but sea lions use their front flippers. If anatomical similarity in the flippers resulted from similar environmental pressures, as posited by the convergent-evolution theory, one 20 would expect walruses and seals, but not seals and sea lions, to have similar flippers.
【新GRE逻辑阅读 每日一练35】相关文章:
最新
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01