Most parents encourage their children to take an active part in social events, _____ those events do not

interfere with their studies. [ ]

A. concerning

B. until

C. unless

D. provided

焦虑症病人的情绪特征（）

A.情感抑郁，思维迟缓，动作行为减少，自我评价低，自责自罪等

B.情感淡漠、情感倒错，毫无原由，毫无意义的独自发笑

C.情感欣快、不稳、幼稚及病理性激情与强制性哭笑等

D.抑郁症状常有波动，带有焦虑的成份，且可找到心理、生理学上的解释

E.不明原因的担心、紧张、害怕，坐立不安等