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　　A letter written by Charles Darwin in 1875 has been returned to the Smithsonian Institution Archives(档案馆) by the FBI after being stolen twice.

　　“We realized in the mid-1970s that it was missing,” says Effie Kapsalis, head of the Smithsonian Institution Archives. “It was noted as missing and likely taken by an intern, from what the FBI is telling us. Word got out that it was missing when someone asked to see the letter for research purposes,” and the intern put the letter back. “The intern likely took the letter again once nobody was watching it.”

　　Decades passed. Finally the FBI received a tip that the stolen document was located very close to Washington, D.C. Their art crime team recovered the letter but were unable to press charges because the time of limitations had ended. The FBI worked closely with the Archives to determine that the letter was both authentic and definitely Smithsonian’s property.

　　The letter was written by Darwin to thank an American geologist, Dr. Ferdinand Vandeveer Hayden, for sending him copies of his research into the geology of the region that would become Yellowstone National Park.

　　The letter is in fairly good condition, in spite of being out of the care of trained museum staff for so long.“It was luckily in good shape,” says Kapsalis,“ and we just have to do some minor things in order to be able to unfold it. It has some glue on it that has colored it slightly, but nothing that will prevent us from using it. After it is repaired, we will take digital photos of it and that will be available online. One of our goals is to get items of high research value or interest to the public online.”

　　It would now be difficult for an intern, visitor or a thief to steal a document like this. “Archiving practices have changed greatly since the 1970s,”says Kapsalis. “and we keep our high value documents in a safe that I don’t even have access to.”

　　51.What happened to Darwin’s letter in the 1970s?

　　A. It was recovered by the FBI.

　　B. It was stolen more than once.

　　C. It was put in the archives for research purposes.

　　D. It was purchased by the Smithsonian Archives.

　　52. What did the FBI do after the recovery of the letter?

　　A. They proved its authenticity.

　　B. They kept it in a special safe.

　　C. They arrested the suspect immediately.

　　D. They pressed criminal charges in vain.

　　53.What is Darwin’s letter about?

　　A. The evolution of Yellowstone National Park.

　　B. His cooperation with an American geologist.

　　C. Some geological evidence supporting his theory.

　　D. His acknowledgement of help from a professional.

　　54. What will the Smithsonian Institution Archives do with the letter according to Kapsalis?

　　A. Reserve it for research purposes only.

　　B. Turn it into an object of high interest.

　　C. Keep it a permanent secret.

　　D. Make it available online.

　　55.What has the past half century witnessed according to Kapsalis?

　　A. Growing interest in rare art objects.

　　B. Radical changes in archiving practices.

　　C. Recovery of various missing documents.

　　D. Increases in the value of museum exhibits.

　　51. B. It was stolen more than once. 根据文章第一段 being stolen twice可以得知Darwin的信件被偷了一次以上。

　　52. D. They pressed criminal charges in vain. 根据第三段第二句“Their art crime team recovered the letter but were unable to press charges because the time of limitations had ended.”意思是由于超过了时间限制，因此不能够起诉犯罪团伙了，选项中的in vain意思是无效 选项意思是FBI起诉犯罪团伙无效符合题意。

　　53. D. His acknowledgement of help from a professional. 根据第四段可以得知Darwin写这封信为了感谢地理学家提供给他一些相关地理方面的材料，D选项acknowledgement意思是感谢，他感谢来自专业人士的帮助，符合文章意思

　　54. D. Make it available online. 根据文章倒数第二段倒数第二句”After it is repaired, we will take digital photos of it and that will be available online. ” 意思是资料修复之后，我们将会拍一些照片放在网上。选项意思与此句完全符合

　　55. B. Radical changes in archiving practices. 选项意思是在实行归档方面发生了根本变化，根据文章最后一段Archiving practices have changed greatly since the 1970s可以得知从1970年开始在实行归档方面发生了巨大变化。符合题意

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