A、Celsius. B、Claudius Day. C、Lupercalia. D、Lubricant Day. C此题考查听细节及关键词同义替换的能力，...origianlly called...与 ．．roots are...为同义词组及最早的

The history of Valentine’s Day is obscure, and further clouded by various fanciful legends. The holiday’s roots are in the ancient Roman festival of Lupercalia, a fertility celebration commemorated annually on February 15. Pope Gelasius I recast this pagan festival as a Christian feast day circa 496, declaring February 14 to be St. Valentine’s Day. Which St. Valentine this early pope intended to honor remains a mystery: according to the Catholic Encyclopedia, there were at least three early Christian saints by that name. One was a priest in Rome, another a bishop in Terni, and of a third St. Valentine almost nothing is known except that he met his end in Africa. Rather astonishingly, all three Valentines were said to have been martyred on Feb. 14.
    Most scholars believe that the St. Valentine of the holiday was a priest who attracted the disfavor of Roman emperor Claudius II around 270. At this stage, the factual ends and the mythic begins. According to one legend, Claudius II had prohibited marriage for young men, claiming that bachelors made better soldiers. Valentine continued to secretly perform marriage ceremonies but was eventually apprehended by the Romans and put to death. An other legend has it that Valentine, imprisoned by Claudius, fell in love with the daughter of his jailer. Before he was executed, he allegedly sent her a letter signed "from your Valentine."