单选题 It wasn't until the late 19th century that physicians realized that its ______ symptoms were all part of the same disease.
A. perfunctory B. peremptory C. perplexing D. perambulatory

【正确答案】 C

【答案解析】[解析] perfunctory“马马虎虎的”；peremptory“断然的，专横的”；perplexing“复杂的，令人困惑的”；perambulatory“闲荡的，巡视的”。