It is reported in the national press that a letter written by Charles Darwin in 1875 has been returned to the Smithsonian Institution Archives（檔案館）by the FBI after being stolen twice.
   "We realized in the mid-1970 s that it was missing."says Effie Kapsalis，head of the Smithsonian Institution Archives."It was noted as missing and likely taken by an intern（實(shí)習(xí)生），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.Then 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（起訴）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 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 coloured it slightly，but nothing will prevent us from using it.After it is repaired，we will take digital photos of it and those 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，a visitor or a thief to steal a document like this."Archiving practices have changed greatly since the1970s，"says Kapsalis，"and we keep our high-value documents in a safe that I don't even have access to."

（1）Darwin's letter was gone from the Archives in the 1970s because

C

C

.
A．someone borrowed it for research purposes
B．it was sent out for careful repair
C．someone might secretly took it away
D．it was made into a picture and kept in a safe
（2）What did the FBI do after finding the letter？

B

B

A．They arrested the suspect immediately.
B．They proved that the letter was the original.
C．They received a tip about the document.
D．They made criminal charges but failed the case.
（3）What will happen to the letter after being repaired according to the text？

A

A

A．Ordinary people will have access to reading it online.
B．The Archives will arrange an exhibition of the letter.
C．The letter will be reserved for research purposes only.
D．Security measures will get improved to protect the letter.
（4）Which of the following can be the best title for the text？

B

B

A．An Intern Was Charged with Theft.
B．A Missing Letter Was Returned.
C．An Exhibit Was Repaired with Efforts.
D．A Criminal case Was Solved.