单选题 Medical students learn to distinguish "acute,"which means something of recent onset, from "chronic," which means a condition that will probably continue for a________period of time.
【正确答案】 D
【答案解析】本题考查词义辨析。选项A为“黑暗的”；选项B为“临时的”；选项C为“艰难的”；选项D为“大量的”。根据句意，故选D。