26.C。推理判断题。根据第一段中的“ For almost half that time, he has been on the Qinghai- Tibet Plateau,where he has devoted his life to photographing and protecting wild animals.”以及第六段中的“Hisexcitement,. as he decided to devote his efforts to saving the gazelle and other endangered animals. Heoften spent time…. to learn what they knew about the animal.”可知,葛对摄影和保护野生动物的坚持以及对高原生态环保的责任感。