How many ______________ are there in the picture?[ ]
A. a bus
B. buses
C. bus
D. some bus
答案:B
Part 1
早期出现无痛性黄疸的疾病是()
A.胆总管下端结石
B.急性胰腺炎
C.假性胰腺囊肿
D.壶腹部癌
E.慢性胰腺炎