16. B解析：根据文章第一段 “It encourages students to challenge themselves in a number of ways and helps them develop physical strength and personal skills.” 可知，该奖项旨在鼓励学生挑战自我（d）、发展体力（b）、提升个人技能（a），未提及给贫困学生奖学金（c），所以选 B。
17. B
解析：由第二段 “It took months for us to prepare, as we had to learn some survival skills.” 可知，作者的探险小组在旅行前做了大量准备，B 正确。A 选项文中未提及露营地点；C 选项与 “learnt all the skills beforehand” 矛盾；D 选项是划独木舟而非游泳，所以排除 A、C、D。
18. C
解析：根据最后一段 “with our teammates to find the right way to paddle (划桨). When we were in trouble, we helped each other out” 可知，“cooperate” 意为 “合作”，与 “work together” 意思一致，选 C。
19. D
解析：从最后一段 “It was an unforgettable experience that turned me into a stronger and more tolerant (宽容的) person.” 可知，作者认为这次经历是难忘且有意义的，选 D。
20. B
解析：最后一段开头 “it was teamwork that really got us through the four days” 点明主旨，强调团队合作对成功的必要性，选 B。
