— Shall I book some seats for the concert? —______. I’ve done that.

A．Yes, you may

B．No, you mustn’t

C．No, you needn’t

D．No, you can’t

角化囊肿属于

A．炎症性囊肿

B．牙源性囊肿

C．发育性囊肿

D．胚胎性囊肿

E．以上都不是