[单项选择]
The Case of the Disappearing Fingerprints
One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing
(51) 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) A. prevent
B. preserve
C. presume
D. prescribe