Neither Tom nor Jack and I ____ his students.

A．are

B．am

C．is

D．was

患儿腹痛后出现频繁呕吐、无排便、无排气，最可能是()

A．先天性巨结肠

B．肠梗阻

C．肠粘连

D．坏死性小肠炎

E．肠套叠