Surviviors of the shipwreck were finally rescued after their courage of persistence lowered to zero by their physical lassitude .
【正确答案】 C
【答案解析】解析：题干：船只失事的幸存者在因为体力透支而导致无力坚持的时候最后获救。划线词lassitude的含义是“无精打采”。选项A为“消耗”，选项B为“脱水”，选项C为“筋疲力尽”，选项D是“残废”。