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28.A。细节理解题。根据第二段第一句“Scientists hope to use the3-D images they have taken to help identifywhich sites are most at--risk to natural disasters and other dangers..”可知。29.C。细节理解题。根据第三段第二句“That area includes a ceremonial center used by the Taino Indians about2,000 years ago.”可知。30.C。推理判断题。结合倒数第三段和倒数第二段内容可知。31.D。主旨大意题。纵观全文，D最合适。
2l.D。细节理解题。根据文章第一段中的“if you plan to do hiking or camping,the best time for a trip is betweenthe end of November and the beginning of March”以及选项可知，D项December25-January 15(l2月25日1月15日)时间符合。故选D项。22.C。细节理解题。根据文章第三段中的“the Futaleufu River is often referred to as one of the best white waterspots for rafting in the world.The landscape along the river is unique and,due to its location,still pretty muchuntouched..”可知，由于地理位置，现在Futaleufú还有很多未开发的地方。故选C项。23.B。细节理解题。根据文章最后段中的“Personally the national park Torres del Paine is my number 1attraction in Patagonia”可知，Torres del Paine最吸引作者。故选B项。
