问题：

[共享题干题]                                                          （一）                                            The Case of the Disappearing Fingerprints阅读材料，回答下列的问题：          One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing____________(51)could become troublesome. A case released online in a letter by Annals of Oncology indicates how big a____________(52) of losing fingerprints is.         Eng-Huat Tan, a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to ____________(53)his nasopharyngeal cancer. After three years on the____________(54), the patient decided to visit U. S. relatives last December. But he was stopped by U. S. customs officials ____________(55)4 hours after entering the country when those officials couldn't get fingerprints from the man. There were no distinctive swirly____________(56) appearing from his index finger.          U.S. customs has been fingerprinting incoming foreign visitors for years, Tan says. Their index fingers are____________(57) and screened against digital files of the fingerprints of bad guys-terrorists and potential criminals that our federal guardians have been tasked with keeping out of the country. Unfortunately, for the Singaporean travelers, one potential____________(58)effect of his drug treatment is a smoothing of the tissue on the finger pads. ____________(59), no fingerprints.           "It is uncertain when fingerprint loss will____________(60) to take place in patients who are taking eapecitabine," Tan points out. So he cautions any physicians who____________(61)the drug to provide their patients with a doctor's note pointing out that their medicine may cause fingerprints to disappear.          Eventually, the Singapore traveler made it into the United States. I guess the name on his passport didn't raise any red flags. But he's-also now got the explanatory doctor's note--and won't leave home ____________(62) it.         By the way, maybe the Food and Drug Administration, ____________(63) approved use of the drug 11 years ago, should consider____________ (64) its list of side effects associated with this medi-cine. The current list does note that patients may experience vomiting, stomach pain and some other side effects. But no where ____________(65) it mention the potential for loss of fingerprints.
不定项选择题第1题____________
A.who
B.Where
C.when
D.which