病历摘要：患者女性，20岁，未婚未育，阵发性右下腹剧痛2小时，伴恶心、呕吐、尿频、尿急。无尿痛和肉眼血尿。无发热。1周前来末次月经。体检：T37℃，P90次/分，R22次/分，BP110/60mmHg。腹平软，右下腹有轻度压痛，无反跳痛。右肾区有叩击痛。

应紧急做哪些检查？（）

A.尿常规

B.IVU

C.泌尿系B超

D.妇科B超

E.磁共振水成像

F.泌尿系CT＋重建

23. The class is unusual_______ the students are all over fifty and none of them attended the middle school when they were young.

A．in how

B．in what

C．in which

D．in that