One usefulanti-cancer drug can effectively erase the whorls（箩状指纹）and other characteristic marks that give peopletheir distinctive fingerprints.Losing_________(51)

could becometroublesome. A case released online in a letter by Annals of Oncology（《肿瘤学年报》）indicates how biga_________(52)of losing fingerprints is.

Eng-Huat Tan,aSingapore-based medical doctor describes a 62-year old man who has usedcapecitabine（卡培他滨，一种化疗药物）to_________( 53 ) his

nasopharyngeal（鼻炎的）cancer.

After three years onthe_________(54),the patient decided to visit U.S.relatives last December. Buthe was stopped by U.S.customs officials__________(55)4 hours after

entering the countrywhen those officials couldn't get fingerprints from the man. There were nodistinctive swirly（旋涡状的）_________(56)appearingfrom his index

finger.

U.S.customs has beenfingerprinting incoming foreign visitors for years,Tan says.Their index fingersare _________(57)and screened against digital files of the fingerprints

of bad guys一terrorists and potential criminalsthat our federal guardians have been tasked with keeping out of the coun-try.Unfortunately,for the Singaporean traveler,one

potential_________(58)effectof his drug treatment is a smoothing of the tissue on the fingerpads.__________(59),no fingerprints.

"It isuncertain when fingerprint loss will__________(60)to take place in patients whoare taking capecitabine,"Tan points out. So he cautions any physicianswho________

(61)the drug to providetheir patients with a doctor's note pointing out that their medicine may causefingerprints to disappear.

Eventually,the Singaporetraveler made it into the United States.I guess the name on his passport didn'traise any red flags.But he is also now got the explanatory doctor's note

一and won'tleave home _________(62)it.

By the way,maybe theFood and Drug Administration,__________(63)approved use of the drug 11 yearsago,should consider_________(64)its list of side effects associated

with this medicine.Thecurrent list does note that patients may experience vomiting,stomach pain andsome other side effects.But no where________(65)it mention the

potential for lossof fingerprints._________(52)

A.theme

B.topic

C.creation

D.problem