[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 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 used capecitabine to
(53) his nasopharyngeal cancer (鼻咽喉). 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
(56) swirly marks appearing from his index finger.
"U. S. customs has been fingerprinting incoming foreign visitors for years." Tan says. "unfortunately, for the Singaporea
A. note
B. name
C. book
D. number
