单选题 He is the most {{U}}intrepid{{/U}} explorer in the present century.
【正确答案】 B
【答案解析】[分析] 形容词辨析 intrepid无畏的,勇猛的;A.successful成功的;B.fearless大胆的,勇敢的,无畏的,不怕的;C.reliable可靠的,可信赖的;D.fearsome可怕的;因此答案为B。