Mr Smith often            his friends' and relatives' houses on weekends.[ ]

A.passes by    

B.comes by    

C.drops by    

D.comes over

能鉴别急性胰腺炎轻型或重症的情况是（）

A.黄疸

B.上腹部疼痛向腰背部放散

C.尿糖阳性

D.血淀粉酶增高

E.血清高铁血白蛋白阳性