等级诊断
参考答案：等级诊断是指将疾病单元分类级别，或反映大脑由重至轻功能障碍的不同症状群，或同一疾病的各亚群间建立一个诊断先后排序等级。
— What a splendid yacht (游艇)! Mr. Smith must be crazy about sailing.
— He only bought one as a status ______; he hates sailing. [ ]
A. mark
B. sign
C. signal
D. symbol
运动焦虑
