Teachers recommend parents _____ their children under 12 to ride bicycles to school for safety. [ ]

A. not allow

B. do not allow

C. mustn't allow

D. couldn't allow

女性，转移性右下腹痛8小时，伴恶心、呕吐，发热，体温38℃，脉搏90/min，右下腹压痛，反跳痛，肌紧张。白细胞12×109/L，尿白细胞1～2个/HP。

最可能的诊断

A．急性胰腺炎

B．急性胆囊炎

C．急性化脓性阑尾炎

D．急性肠梗阻

E．消化性溃疡穿孔