使维生素B12保持相对稳定的条件是（）
A.强碱
B.光照
C.中性溶液
D.酸性溶液
E.强酸
参考答案：C
— John hit me, Mum!
— _____. You shouldn't have been rude to him. [ ]
A. That's absolutely right
B. Don't be disappointed
C. It doesn't matter
D. It serves you right
女性，47岁。消化性溃疡病史2年，近期反复出现腹痛，1天前出现呕吐，呕吐物为大量隔夜宿食。该患者的诊断可能是（）。
A.慢性胃炎
B.幽门梗阻
C.急性肝炎
D.急性胰腺炎
E.急性糜烂性胃炎
