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第六部分：完形填空(第51-65题，每题1分，共15分)
阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。
The Case of the Disappearing Fingerprints
One useful anti-cancer drug can effectively erase the whorls and other characteristic marks thatgive people their distinctive fingerprints(指纹)．Losing them could become troublesome．A case___________(51)online in a letter by Annals of Oncology(肿瘤学)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 usedcapecitabine to_________(53)his nasopharyngeal cancer(鼻咽癌)．After three years on the (54)，the patient decided to visit U．S．relatives last December．But he was stopped byU．S．customs officials__________(55)4 hours after entering the country when those officialscouldnt get fingerprints from the man．There were no___________(56)swirly marks appearing fromhis index finger．
U．S．customs has been fingerprinting incoming foreign visitors for years，Tan says．unfortunately,for the Singaporean traveler，one potential__________(57)effect of his drug treatment is a smoothing of the tissue on the finger pads．_________(58)，no fingerprints．
It is uncertain when fingerprint_________(59)will begin to take place in patients who are taking capecitabine，Tan points out．So he__________(60)any physicians who prescribe the drug to provide their patients with a doctors_________(61)pointing out that their medicine may causefingerprints to disappear．
Eventually，the Singapore traveler made it into the United States．I guess the name on his pass-port didnt raise any red flags．But hes also now got the explanatory doctors note-and wont 1eavehome___________(62)it．
By the way，maybe the Food and Drug Administration(美国食品药物管理局)，_________(63)approved use of the drug 11 years ago，should consider updating its list of side effects________(64)with this medicine．The current list does note that patients may experience vomiting(呕吐)，stomach pain and some other side effects．But no where___________(65)it mention the po．tential for loss of fingerprints．
51．A．released B．suggested C．accepted D．detected
52．A．problem B．gap C．sickness D．secret
53．A．cut B．treat C．find D．smooth
54．A．diet B．exercise C．recovery D．drug
55．A．in B．for C．at D．from
56．A．different B．strange C．interesting D．distinctive
57．A．good B．side C．normal D．main
58．A．However B．Meanwhile C．Hence D．Yet
59．A．chance B．mark C．loss D．danger
60．A．reports B．discourage C．cautions D．praise
61．A．note B．name C．book D．number
62．A．on B．out C．without D．off
63．A．who B．when C．which D．where
64．A．collected B．copied C．associated D．tested
65．A．must B．does C．can D．shouId