含有淀粉酶的囊肿是
A．口底皮样囊肿
B．鳃裂囊肿
C．舌下腺囊肿
D．甲状舌管囊肿
E．角化囊肿
参考答案：C
You look unhappy. What ________ just now? [ ]
A. did you happen
B. did happen to you
C. happened to you
D. you happened
社会关系的（）和（）使得社会关系的协调与平衡十分困难。
