题目

阅读理解 Bargainhunters spent a record of 168.2 billion yuan ($25.3 billion; 21.7 billioneuros; ￡19.3 billion) during the 2017 Singles Day on Nov. 11, the world'slargest daylong discount festival, as e-commerce giant Alibaba Group tookonline shopping to offline stores and beyond(超越) thenation's borders(边界). Spendingclimbed by 39.3 percent during this year's sale, as consumers from 225countries and regions scooped up goods from 140,000 brands (品牌)that offered promotions during the annual event. Alibabasurpassed last year's 120.7 billion yuan total shortly after 1 pm, as overse下列哪位航海家首次实现了人类环绕地球一周的航行，证明地球是一个球体？（ ）A．麦哲伦B．郑和C．哥伦布D．马可波罗