根据空后“Though he was born 1, 600 meters above sea level”可知，空处是说他出生在海拔1600米的地方，结合选项可知，“Mr. Purja was born in Nepal, in the Himalayas”符合语境。故选A。
52.F【解析】句意：2018年，他离开那里追寻自己的登山梦想。
根据空前句“He used to be a soldier in the British army, where he had special training for fighting in very cold weather.”可知，他曾经是英国军队的一名士兵，在那里他接受过在非常寒冷的天气里战斗的特殊训练；结合后面一段讲的是Purja爬山的情况，所以“2018年，他离开那里追寻自己的登山梦想”承前启后，符合语境。故选F。
53.D【解析】句意：他的目标是在不到七个月的时间里把它们全部爬上去。
根据空前句“Mr. Purja had already climbed several of them. Purja先生已经爬了它们中若干个。”及后面“The old record for climbing the 14 mountains was seven years, ten months and six days. 爬这14座山的旧记录是七年十个月六天。”可知，空处是说他要爬上这14座山；结合选项可知，“His goal was to climb all of them in less than seven months.”符合语境。故选D。
54.C【解析】句意：他以4月23日攀登尼泊尔的安娜普尔纳为开始。
根据后面“On October 29, just a little more than six months after he started, Nirmal Purja had finished climbing the 14th mountain. 10月29日，就在他开始的六个多月后，Nirmal Purja完成了第14座山的攀登。”可知，此处是说他何时开始，与后面的何时结束形成对应，所以“He began on April 23, by climbing Annapurna in Nepal”符合语境。故选C。
55.E【解析】句意：他们不得不应对时速75公里的大风。
根据前面“during one day of climbing Shishapangma Mr. Purja and his team climbed for 15 hours nonstop. 在攀登希夏邦马峰的一天里，Purja先生和他的团队连续攀登了15个小时。”可知，此处是说他们攀登的困难，结合选项可知，“They had to deal with winds as fast as 75 kilometers per hour.”符合语境。故选E。