【题目】The students are holding a heated discussion about what clothes are______for school wear.
A. formal B. appropriate
C. correct D. appreciate
在线课程【答案】B
【解析】A. formal正式的；B. appropriate合适的；C. correct正确的；D. appreciate欣赏，感激。句意：同学们正在热烈讨论是否有必要穿校服。根据句意可知选B。