Dr. La Farge took samples of the moss and, using carbon­dating techniques, discovered that the plants date back to the Little Ice Age. Dr. La Farge's team took the samples, planted them in dishes full of nutrient­rich potting soil and fed them with water.

　　The samples were from four separate species including Aulacomnium turgidum, Distichium capillaceum, Encalypta procera and Syntrichia ruralis. The moss plants found by Dr. La Farge are types of bryophytes. Bryophytes can survive long winters and regrow when the weather gets warmer.

　　However, Dr. La Farge was surprised that the plants buried under ice have survived into the 21st century. Her findings appear in Proceedings (论文集) of the National Academy of Sciences.

　　语篇解读：本文是一篇说明文。文章介绍了生物学家凯瑟琳·拉·法奇博士和她的团队发现400年前冰封在冰川里的苔藓类植物，带回实验室后放置在营养丰富的土壤中，浇水之后这些植物又再次生长。

　　5．Dr. La Farge's research is of great importance to ________.

　　A．knowing what the plants during the Little Ice Age were like

　　B．understanding how ecosystems recover from glaciers

　　C．regrowing many species that have been destroyed before

　　D．figuring out the effects of melting ice caps on moss

　　答案：B　推理判断题。根据第二段第二句“Findings suggest that these plants could help repopulate regions exposed by melting ice caps.”可知研究表明这些植物有望重新覆盖冰盖融化地区。由此推断该研究有利于当地的生态系统从冰川中恢复过来。故选B项。

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