单选题 If you don"t slow down and take a break, you"ll be burned out very quickly.
【正确答案】 C
【答案解析】[解析] distressed“难过的”；anxious“焦虑的”；exhausted“疲劳的”；upset“伤心的”。be burned out“燃烧殆尽的；筋疲力尽的”和exhausted意思最接近，故选C。