[解析]
49.C.推理判断题.根据文章第一段中陈述"In China,many common people,besides soldiers (军人),are doing what they can to keep the border safe.Wei Deyou is one of them."可知除士兵外,许多普通人正在尽可能的保护边疆安全,Wei Deyou便是其中之一.故选C.
50.D.细节理解题.根据时间状语将答案定位在第三段,文章陈述"One cold winter day in 1987,when Wei was on his way home from work,a heavy snowstorm came.He lost his way and walked for several hours."可知1987年一个寒冷的冬天,当魏在下班回家的路上,一场暴风雪来了.他迷路了,走了好几个小时.故选D.
51.B.综合判断题.根据文章最后一段Wei has been working in Xinjiang for over 50 years及下文,可知这里讲到Wei为新疆工作50年从不放弃,他步行200.000 千米,找到许多更好的保障边疆安全的方法,受到许多嘉奖,70多岁了,仍然要在那里工作,因为他知道保护边疆是我们的职责,他是我们的榜样.选项分析:A.Wei has returned to his hometown.Wei返回来他的家乡;B.Wei will continue working in Xinjiang.Wei将继续为新疆工作;C.Wei has new ways to keep his sheep safe.Wei有新的保障羊安全的方法;D.Wei is too old to work.Wei太老了不能再工作;可知,选项A、C和D在文章中没有提到,而B选项意思与文中表达一致.故选B.